IELTS Exam Vocabulary List - I
- ichthyic adj. Fish-like.
- ichthyology n. The branch of zoology that treats of fishes.
- ichthyosaurs n. A fossil reptile.
- icily adv. Frigidly.
- iciness n. The state of being icy.
- icon n. An image or likeness.
- iconoclast n. An image-breaker.
- idealize v. To make to conform to some mental or imaginary standard.
- idiom n. A use of words peculiar to a particular language.
- idiosyncrasy n. A mental quality or habit peculiar to an individual.
- idolize v. To regard with inordinate love or admiration.
- ignoble adj. Low in character or purpose.
- ignominious adj. Shameful.
- Iliad n. A Greek epic poem describing scenes from the siege of Troy.
- illegal adj. Not according to law.
- illegible adj. Undecipherable.
- illegitimate adj. Unlawfully begotten.
- illiberal adj. Stingy.
- illicit adj. Unlawful.
- illimitable adj. Boundless.
- illiterate adj. Having little or no book-learning.
- ill-natured adj. Surly.
- illogical adj. Contrary to the rules of sound thought.
- illuminant n. That which may be used to produce light.
- illuminate v. To supply with light.
- illumine v. To make bright or clear.
- illusion n. An unreal image presented to the senses.
- illusive adj. Deceptive.
- illusory adj. Deceiving or tending to deceive, as by false appearance.
- imaginable adj. That can be imagined or conceived in the mind.
- imaginary adj. Fancied.
- imbibe v. To drink or take in.
- imbroglio n. A misunderstanding attended by ill feeling, perplexity, or strife.
- imbrue v. To wet or moisten.
- imitation n. That which is made as a likeness or copy.
- imitator n. One who makes in imitation.
- immaculate adj. Without spot or blemish.
- immaterial adj. Of no essential consequence.
- immature adj. Not full-grown.
- immeasurable adj. Indefinitely extensive.
- immense adj. Very great in degree, extent, size, or quantity.
- immerse v. To plunge or dip entirely under water or other fluid.
- immersion n. The act of plunging or dipping entirely under water or another fluid.
- immigrant n. A foreigner who enters a country to settle there.
- immigrate v. To come into a country or region from a former habitat.
- imminence n. Impending evil or danger.
- imminent adj. Dangerous and close at hand.
- immiscible adj. Separating, as oil and water.
- immoral adj. Habitually engaged in licentious or lewd practices.
- immortalize v. To cause to last or to be known or remembered throughout a great or indefinite length of time.
- immovable adj. Steadfast.
- immune adj. Exempt, as from disease.
- immutable adj. Unchangeable.
- impair v. To cause to become less or worse.
- impalpable adj. Imperceptible to the touch.
- impartial adj. Unbiased.
- impassable adj. That can not be passed through or over.
- impassible adj. Not moved or affected by feeling.
- impassive adj. Unmoved by or not exhibiting feeling.
- impatience n. Unwillingness to brook delays or wait the natural course of things.
- impeccable adj. Blameless.
- impecunious adj. Having no money.
- impede v. To be an obstacle or to place obstacles in the way of.
- impel v. To drive or urge forward.
- impend v. To be imminent.
- imperative adj. Obligatory.
- imperceptible adj. Indiscernible.
- imperfectible adj. That can not be perfected.
- imperil v. To endanger.
- imperious adj. Insisting on obedience.
- impermissible adj. Not permissible.
- impersonal adj. Not relating to a particular person or thing.
- impersonate v. To appear or act in the character of.
- impersuadable adj. Unyielding.
- impertinence n. Rudeness.
- imperturbable adj. Calm.
- impervious adj. Impenetrable.
- impetuosity n. Rashness.
- impetuous adj. Impulsive.
- impetus n. Any impulse or incentive.
- impiety n. Irreverence toward God.
- impious adj. Characterized by irreverence or irreligion.
- implausible adj. Not plausible.
- impliable adj. Capable of being inferred.
- implicate v. To show or prove to be involved in or concerned
- implicit adj. Implied.
- imply v. To signify.
- impolitic adj. Inexpedient.
- importation n. The act or practice of bringing from one country into another.
- importunate adj. Urgent in character, request, or demand.
- importune v. To harass with persistent demands or entreaties.
- impotent adj. Destitute of or lacking in power, physical, moral, or intellectual.
- impoverish v. To make indigent or poor.
- impracticable adj. Not feasible.
- impregnable adj. That can not be taken by assault.
- impregnate v. To make pregnant.
- impromptu n. Anything done or said on the impulse of the moment.
- improper adj. Not appropriate, suitable, or becoming.
- impropriety n. The state or quality of being unfit, unseemly, or inappropriate.
- improvident adj. Lacking foresight or thrift.
- improvise v. To do anything extemporaneously or offhand.
- imprudent adj. Heedless.
- impudence n. Insolent disrespect.
- impugn v. To assail with arguments, insinuations, or accusations.
- impulsion n. Impetus.
- impulsive adj. Unpremeditated.
- impunity n. Freedom from punishment.
- impure adj. Tainted.
- impute v. To attribute.
- inaccessible adj. Difficult of approach.
- inaccurate adj. Not exactly according to the facts.
- inactive adj. Inert.
- inadequate adj. Insufficient.
- inadmissible adj. Not to be approved, considered, or allowed, as testimony.
- inadvertent adj. Accidental.
- inadvisable adj. Unadvisable.
- inane adj. Silly.
- inanimate adj. Destitute of animal life.
- inapprehensible adj. Not to be understood.
- inapt adj. Awkward or slow.
- inarticulate adj. Speechless.
- inaudible adj. That can not be heard.
- inborn adj. Implanted by nature.
- inbred adj. Innate.
- incandescence n. The state of being white or glowing with heat.
- incandescent adj. White or glowing with heat.
- incapacitate v. To deprive of power, capacity, competency, or qualification.
- incapacity n. Want of power to apprehend, understand, and manage.
- incarcerate v. To imprison.
- incendiary n. Chemical or person who starts a fire-literally or figuratively.
- incentive n. That which moves the mind or inflames the passions.
- inception n. The beginning.
- inceptive adj. Beginning.
- incessant adj. Unceasing.
- inchmeal adv. Piecemeal.
- inchoate adj. Incipient.
- inchoative n. That which begins, or expresses beginning.
- incidence n. Casual occurrence.
- incident n. A happening in general, especially one of little importance.
- incidentally adv. Without intention.
- incinerate v. To reduce to ashes.
- incipience n. Beginning.
- incipient adj. Initial.
- incisor n. A front or cutting tooth.
- incite v. To rouse to a particular action.
- incitement n. That which moves to action, or serves as an incentive or stimulus.
- incoercible adj. Incapable of being forced, constrained, or compelled.
- incoherence n. Want of connection, or agreement, as of parts or ideas in thought, speech, etc.
- incoherent adj. Not logically coordinated, as to parts, elements, or details.
- incombustible adj. That can not be burned.
- incomparable adj. Matchless.
- incompatible adj. Discordant.
- incompetence n. General lack of capacity or fitness.
- incompetent adj. Not having the abilities desired or necessary for any purpose.
- incomplete adj. Lacking some element, part, or adjunct necessary or required.
- incomprehensible adj. Not understandable.
- incompressible adj. Resisting all attempts to reduce volume by pressure.
- inconceivable adj. Incomprehensible.
- incongruous adj. Unsuitable for the time, place, or occasion.
- inconsequential adj. Valueless.
- inconsiderable adj. Small in quantity or importance.
- inconsistent adj. Contradictory.
- inconstant adj. Changeable.
- incontrovertible adj. Indisputable.
- inconvenient adj. Interfering with comfort or progress.
- indefensible adj. Untenable.
- indefinitely adv. In a vague or uncertain way.
- indelible adj. That can not be blotted out, effaced, destroyed, or removed.
- indescribable adj. That can not be described.
- indestructible adj. That can not be destroyed.
- indicant adj. That which points out.
- indicator n. One who or that which points out.
- indict v. To find and declare chargeable with crime.
- indigence n. Poverty.
- indigenous adj. Native.
- indigent adj. Poor.
- indigestible adj. Not digestible, or difficult to digest.
- indigestion n. Difficulty or failure in the alimentary canal in changing food into absorptive nutriment.
- indignant adj. Having such anger and scorn as is aroused by meanness or wickedness.
- indignity n. Unmerited contemptuous conduct or treatment.
- indiscernible adj. Not perceptible.
- indiscreet adj. Lacking wise judgment.
- indiscriminate adj. Promiscuous.
- indispensable adj. Necessary or requisite for the purpose.
- indistinct adj. Vague.
- indivertible adj. That can not be turned aside.
- indivisible adj. Not separable into parts.
- indolence n. Laziness.
- indolent adj. Habitually inactive or idle.
- indomitable adj. Unconquerable.
- induct v. To bring in.
- indulgence n. The yielding to inclination, passion, desire, or propensity in oneself or another.
- indulgent adj. Yielding to the desires or humor of oneself or those under one's care.
- inebriate v. To intoxicate.
- inedible adj. Not good for food.
- ineffable adj. Unutterable.
- inefficient adj. Not accomplishing an intended purpose.
- inefficiency n. That which does not accomplish an intended purpose.
- ineligible adj. Not suitable to be selected or chosen.
- inept adj. Not fit or suitable.
- inert adj. Inanimate.
- inestimable adj. Above price.
- inevitable adj. Unavoidable.
- inexcusable adj. Not to be justified.
- inexhaustible adj. So large or furnishing so great a supply as not to be emptied, wasted, or spent.
- inexorable adj. Unrelenting.
- inexpedient adj. Unadvisable.
- inexpensive adj. Low-priced.
- inexperience n. Lack of or deficiency in experience.
- inexplicable adj. Such as can not be made plain.
- inexpressible adj. Unutterable.
- inextensible adj. Of unchangeable length or area.
- infallible adj. Exempt from error of judgment, as in opinion or statement.
- infamous adj. Publicly branded or notorious, as for vice, or crime.
- infamy n. Total loss or destitution of honor or reputation.
- inference n. The derivation of a judgment from any given material of knowledge on the ground of law.
- infernal adj. Akin to or befitting hell or its occupants.
- infest v. To be present in such numbers as to be a source of annoyance, trouble, or danger.
- infidel n. One who denies the existence of God.
- infidelity n. Disloyalty.
- infinite adj. Measureless.
- infinity n. Boundless or immeasurable extension or duration.
- infirm adj. Lacking in bodily or mental strength.
- infirmary n. A place for the reception or treatment of the sick.
- infirmity n. A physical, mental, or moral weakness or flaw.
- inflammable adj. Easily set on fire or excited.
- inflammation n. A morbid process in some part of the body characterized by heat, swelling, and pain.
- inflexible adj. That can not be altered or varied.
- influence n. Ability to sway the will of another.
- influential adj. Having the power to sway the will of another.
- influx n. Infusion.
- infrequence n. Rareness.
- infrequent adj. Uncommon.
- infringe v. To trespass upon.
- infuse v. To instill, introduce, or inculcate, as principles or qualities.
- infusion n. The act of imbuing, or pouring in.
- ingenious adj. Evincing skill, originality, or cleverness, as in contrivance or arrangement.
- ingenuity n. Cleverness in contriving, combining, or originating.
- ingenuous adj. Candid, frank, or open in character or quality.
- inglorious adj. Shameful.
- ingraft v. To set or implant deeply and firmly.
- ingratiate v. To win confidence or good graces for oneself.
- ingratitude n. Insensibility to kindness.
- ingredient n. Component.
- inherence n. The state of being permanently existing in something.
- inherent adj. Intrinsic.
- inhibit v. To hold back or in.
- inhospitable adj. Not disposed to entertain strangers gratuitously.
- inhuman adj. Savage.
- inhume v. To place in the earth, as a dead body.
- inimical adj. Adverse.
- iniquity n. Gross wrong or injustice.
- initiate v. To perform the first act or rite.
- inject v. To introduce, as a fluid, by injection.
- injunction n. Mandate.
- inkling n. A hint.
- inland adj. Remote from the sea.
- inlet n. A small body of water leading into a larger.
- inmost adj. Deepest within.
- innocuous adj. Harmless.
- innovate v. To introduce or strive to introduce new things.
- innuendo n. Insinuation.
- innumerable adj. Countless.
- inoffensive adj. Causing nothing displeasing or disturbing.
- inopportune adj. Unsuitable or inconvenient, especially as to time.
- inquire v. To ask information about.
- inquisition n. A court or tribunal for examination and punishment of heretics.
- inquisitive adj. Given to questioning, especially out of curiosity.
- inquisitor n. One who makes an investigation.
- inroad n. Forcible encroachment or trespass.
- insatiable adj. That desires or craves immoderately or unappeasably.
- inscribe v. To enter in a book, or on a list, roll, or document, by writing.
- inscrutable adj. Impenetrably mysterious or profound.
- insecure adj. Not assured of safety.
- insensible adj. Imperceptible.
- insentient adj. Lacking the power of feeling or perceiving.
- inseparable adj. That can not be separated.
- insidious adj. Working ill by slow and stealthy means.
- insight n. Intellectual discernment.
- insignificance n. Lack of import or of importance.
- insignificant adj. Without importance, force, or influence.
- insinuate v. To imply.
- insipid adj. Tasteless.
- insistence n. Urgency.
- insistent adj. Urgent.
- insolence n. Pride or haughtiness exhibited in contemptuous and overbearing treatment of others.
- insolent adj. Impudent.
- insomnia n. Sleeplessness.
- inspector n. An official appointed to examine or oversee any matter of public interest or importance.
- instance n. A single occurrence or happening of a given kind.
- instant n. A very brief portion of time.
- instantaneous adj. Done without perceptible lapse of time.
- instigate v. To provoke.
- instigator n. One who incites to evil.
- instill v. To infuse.
- instructive adj. Conveying knowledge.
- insufficiency n. Inadequacy.
- insufficient adj. Inadequate for some need, purpose, or use.
- insular adj. Pertaining to an island.
- insulate v. To place in a detached state or situation.
- insuperable adj. Invincible.
- insuppressible adj. Incapable of being concealed.
- insurgence n. Uprising.
- insurgent n. One who takes part in forcible opposition to the constituted authorities of a place.
- insurrection n. The state of being in active resistance to authority.
- intangible adj. Not perceptible to the touch.
- integrity n. Uprightness of character and soundness of moral principle.
- intellect n. The faculty of perception or thought.
- intellectual adj. Characterized by intelligence.
- intelligence n. Capacity to know or understand.
- intelligible adj. Comprehensible.
- intemperance n. Immoderate action or indulgence, as of the appetites.
- intension n. The act of stringing or stretching, or state of being strained.
- intensive adj. Adding emphasis or force.
- intention n. That upon which the mind is set.
- interact v. To act reciprocally.
- intercede v. To mediate between persons.
- intercept v. To interrupt the course of.
- intercession n. Entreaty in behalf of others.
- intercessor n. A mediator.
- interdict n. Authoritative act of prohibition.
- interim n. Time between acts or periods.
- interlocutor n. One who takes part in a conversation or oral discussion.
- interlude n. An action or event considered as coming between others of greater length.
- intermediate adj. Being in a middle place or degree or between extremes.
- interminable adj. Having no limit or end.
- intermission n. A recess.
- intermit v. To cause to cease temporarily.
- intermittent adj. A temporary discontinuance.
- interpolation n. Verbal interference.
- interpose v. To come between other things or persons.
- interposition n. A coming between.
- interpreter n. A person who makes intelligible the speech of a foreigner by oral translation.
- interrogate v. To examine formally by questioning.
- interrogative adj. Having the nature or form of a question.
- interrogatory n. A question or inquiry.
- interrupt v. To stop while in progress.
- intersect v. To cut through or into so as to divide.
- intervale n. A low tract of land between hills, especially along a river.
- intervene v. To interfere for some end.
- intestacy n. The condition resulting from one's dying not having made a valid will.
- intestate adj. Not having made a valid will.
- intestine n. That part of the digestive tube below or behind the stomach, extending to the anus.
- intimacy n. Close or confidential friendship.
- intimidate v. To cause to become frightened.
- intolerable adj. Insufferable.
- intolerance n. Inability or unwillingness to bear or endure.
- intolerant adj. Bigoted.
- intoxicant n. Anything that unduly exhilarates or excites.
- intoxicate v. To make drunk.
- intracellular adj. Occurring or situated within a cell.
- intramural adj. Situated within the walls of a city.
- intrepid adj. Fearless and bold.
- intricacy n. Perplexity.
- intricate adj. Difficult to follow or understand.
- intrigue n. A plot or scheme, usually complicated and intended to accomplish something by secret ways.
- intrinsic adj. Inherent.
- introductory adj. Preliminary.
- introgression n. Entrance.
- intromit v. To insert.
- introspect v. To look into.
- introspection n. The act of observing and analyzing one's own thoughts and feelings.
- introversion n. The act of turning or directing inward, physically or mentally.
- introvert v. To turn within.
- intrude v. To come in without leave or license.
- intrusion n. The act of entering without warrant or invitation; encroachment.
- intuition n. Instinctive knowledge or feeling.
- inundate v. To fill with an overflowing abundance.
- inundation n. Flood.
- inure v. To harden or toughen by use, exercise, or exposure.
- invalid adj. Having no force, weight, or cogency.
- invalid n. One who is disabled by illness or injury.
- invalidate v. To render of no force or effect.
- invaluable adj. Exceedingly precious.
- invariable adj. Unchangeable.
- invasion n. Encroachment, as by an act of intrusion or trespass.
- invective n. An utterance intended to cast censure, or reproach.
- inveigh v. To utter vehement censure or invective.
- inventive adj. Quick at contrivance.
- inverse adj. Contrary in tendency or direction.
- inversion n. Change of order so that the first shall become last and the last first.
- invert v. To turn inside out, upside down, or in opposite direction.
- investigator n. One who investigates.
- investor n. One who invests money.
- inveterate adj. Habitual.
- invidious adj. Showing or feeling envy.
- invigorate v. To animate.
- invincible adj. Not to be conquered, subdued, or overcome.
- inviolable adj. Incapable of being injured or disturbed.
- invoke v. To call on for assistance or protection.
- involuntary adj. Unwilling.
- involution n. Complication.
- involve v. To draw into entanglement, literally or figuratively.
- invulnerable adj. That can not be wounded or hurt.
- inwardly adv. With no outward manifestation.
- iota n. A small or insignificant mark or part.
- irascible adj. Prone to anger.
- irate adj. Moved to anger.
- ire n. Wrath.
- iridescence n. A many-colored appearance.
- iridescent adj. Exhibiting changing rainbow-colors due to the interference of the light.
- irk v. To afflict with pain, vexation, or fatigue.
- irksome adj. Wearisome.
- irony n. Censure or ridicule under cover of praise or compliment.
- irradiance n. Luster.
- irradiate v. To render clear and intelligible.
- irrational adj. Not possessed of reasoning powers or understanding.
- irreducible adj. That can not be lessened.
- irrefragable adj. That can not be refuted or disproved.
- irrefrangible adj. That can not be broken or violated.
- irrelevant adj. Inapplicable.
- irreligious adj. Indifferent or opposed to religion.
- irreparable adj. That can not be rectified or made amends for.
- irrepressible adj. That can not be restrained or kept down.
- irresistible adj. That can not be successfully withstood or opposed.
- irresponsible adj. Careless of or unable to meet responsibilities.
- irreverence n. The quality showing or expressing a deficiency of veneration, especially for sacred things.
- irreverent adj. Showing or expressing a deficiency of veneration, especially for sacred things.
- irreverential adj. Showing or expressing a deficiency of veneration, especially for sacred things.
- irreversible adj. Irrevocable.
- irrigant adj. Serving to water lands by artificial means.
- irrigate v. To water, as land, by ditches or other artificial means.
- irritable adj. Showing impatience or ill temper on little provocation.
- irritancy n. The quality of producing vexation.
- irritant n. A mechanical, chemical, or pathological agent of inflammation, pain, or tension.
- irritate v. To excite ill temper or impatience in.
- irruption n. Sudden invasion.
- isle n. An island.
- islet n. A little island.
- isobar n. A line joining points at which the barometric pressure is the same at a specified moment.
- isochronous adj. Relating to or denoting equal intervals of time.
- isolate v. To separate from others of its kind.
- isothermal adj. Having or marking equality of temperature.
- itinerant adj. Wandering.
- itinerary n. A detailed account or diary of a journey.
- itinerate v. To wander from place to place.
Main IELTS Pages
Improve your IELTS skills with our IELTS sample practice Tests, lessons and free preparation tips.Don't Miss A Single Updates
✓Remember to check your email account to confirm your subscription.
