SAT Vocabulary Words 13

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Approximately 5000 vocabulary words that should be memorized before taking the SAT. This lesson is broken into 26 parts.

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indigestion

indigestion (n)
Difficulty or failure in the alimentary canal in changing food into absorptive nutriment.

indignant

indignant (adj)
Having such anger and scorn as is aroused by meanness or wickedness.

indignity

indignity (n)
Unmerited contemptuous conduct or treatment.

indiscernible

indiscernible (adj)
Not perceptible.

indiscreet

indiscreet (adj)
Lacking wise judgment.

indiscriminate

indiscriminate (adj)
Promiscuous.

indispensable

indispensable (adj)
Necessary or requisite for the purpose.

indistinct

indistinct (adj)
Vague.

indivertible

indivertible (adj)
That can not be turned aside.

indivisible

indivisible (adj)
Not separable into parts.

indolence

indolence (n)
Laziness.

indolent

indolent (adj)
Habitually inactive or idle.

indomitable

indomitable (adj)
Unconquerable.

induct

induct (v)
To bring in.

indulgence

indulgence (n)
The yielding to inclination, passion, desire, or propensity in oneself or another.

indulgent

indulgent (adj)
Yielding to the desires or humor of oneself or those under one's care.

inebriate

inebriate (v)
To intoxicate.

inedible

inedible (adj)
Not good for food.

ineffable

ineffable (adj)
Unutterable.

inefficient

inefficient (adj)
Not accomplishing an intended purpose.

inefficiency

inefficiency (n)
That which does not accomplish an intended purpose.

ineligible

ineligible (adj)
Not suitable to be selected or chosen.

inept

inept (adj)
Not fit or suitable.

inert

inert (adj)
Inanimate.

inestimable

inestimable (adj)
Above price.

inevitable

inevitable (adj)
Unavoidable.

inexcusable

inexcusable (adj)
Not to be justified.

inexhaustible

inexhaustible (adj)
So large or furnishing so great a supply as not to be emptied, wasted, or spent.

inexorable

inexorable (adj)
Unrelenting.

inexpedient

inexpedient (adj)
Unadvisable.

inexpensive

inexpensive (adj)
Low-priced.

inexperience

inexperience (n)
Lack of or deficiency in experience.

inexplicable

inexplicable (adj)
Such as can not be made plain.

inexpressible

inexpressible (adj)
Unutterable.

inextensible

inextensible (adj)
Of unchangeable length or area.

infallible

infallible (adj)
Exempt from error of judgment, as in opinion or statement.

infamous

infamous (adj)
Publicly branded or notorious, as for vice, or crime.

infamy

infamy (n)
Total loss or destitution of honor or reputation.

inference

inference (n)
The derivation of a judgment from any given material of knowledge on the ground of law.

infernal

infernal (adj)
Akin to or befitting hell or its occupants.

infest

infest (v)
To be present in such numbers as to be a source of annoyance, trouble, or danger.

infidel

infidel (n)
One who denies the existence of God.

infidelity

infidelity (n)
Disloyalty.

infinite

infinite (adj)
Measureless.

infinity

infinity (n)
Boundless or immeasurable extension or duration.

infirm

infirm (adj)
Lacking in bodily or mental strength.

infirmary

infirmary (n)
A place for the reception or treatment of the sick.

infirmity

infirmity (n)
A physical, mental, or moral weakness or flaw.

inflammable

inflammable (adj)
Easily set on fire or excited.

inflammation

inflammation (n)
A morbid process in some part of the body characterized by heat, swelling, and pain.

inflexible

inflexible (adj)
That can not be altered or varied.

influence

influence (n)
Ability to sway the will of another.

influential

influential (adj)
Having the power to sway the will of another.

influx

influx (n)
Infusion.

infrequence

infrequence (n)
Rareness.

infrequent

infrequent (adj)
Uncommon.

infringe

infringe (v)
To trespass upon.

infuse

infuse (v)
To instill, introduce, or inculcate, as principles or qualities.

infusion

infusion (n)
The act of imbuing, or pouring in.

ingenious

ingenious (adj)
Evincing skill, originality, or cleverness, as in contrivance or arrangement.

ingenuity

ingenuity (n)
Cleverness in contriving, combining, or originating.

ingenuous

ingenuous (adj)
Candid, frank, or open in character or quality.

inglorious

inglorious (adj)
Shameful.

ingraft

ingraft (v)
To set or implant deeply and firmly.

ingratiate

ingratiate (v)
To win confidence or good graces for oneself.

ingratitude

ingratitude (n)
Insensibility to kindness.

ingredient

ingredient (n)
Component.

inherence

inherence (n)
The state of being permanently existing in something.

inherent

inherent (adj)
Intrinsic.

inhibit

inhibit (v)
To hold back or in.

inhospitable

inhospitable (adj)
Not disposed to entertain strangers gratuitously.

inhuman

inhuman (adj)
Savage.

inhume

inhume (v)
To place in the earth, as a dead body.

inimical

inimical (adj)
Adverse.

iniquity

iniquity (n)
Gross wrong or injustice.

initiate

initiate (v)
To perform the first act or rite.

inject

inject (v)
To introduce, as a fluid, by injection.

injunction

injunction (n)
Mandate.

inkling

inkling (n)
A hint.

inland

inland (adj)
Remote from the sea.

inlet

inlet (n)
A small body of water leading into a larger.

inmost

inmost (adj)
Deepest within.

innocuous

innocuous (adj)
Harmless.

innovate

innovate (v)
To introduce or strive to introduce new things.

innuendo

innuendo (n)
Insinuation.

innumerable

innumerable (adj)
Countless.

inoffensive

inoffensive (adj)
Causing nothing displeasing or disturbing.

inopportune

inopportune (adj)
Unsuitable or inconvenient, especially as to time.

inquire

inquire (v)
To ask information about.

inquisition

inquisition (n)
A court or tribunal for examination and punishment of heretics.

inquisitive

inquisitive (adj)
Given to questioning, especially out of curiosity.

inquisitor

inquisitor (n)
One who makes an investigation.

inroad

inroad (n)
Forcible encroachment or trespass.

insatiable

insatiable (adj)
That desires or craves immoderately or unappeasably.

inscribe

inscribe (v)
To enter in a book, or on a list, roll, or document, by writing.

inscrutable

inscrutable (adj)
Impenetrably mysterious or profound.

insecure

insecure (adj)
Not assured of safety.

insensible

insensible (adj)
Imperceptible.

insentient

insentient (adj)
Lacking the power of feeling or perceiving.

inseparable

inseparable (adj)
That can not be separated.

insidious

insidious (adj)
Working ill by slow and stealthy means.

insight

insight (n)
Intellectual discernment.

insignificance

insignificance (n)
Lack of import or of importance.

insignificant

insignificant (adj)
Without importance, force, or influence.

insinuate

insinuate (v)
To imply.

insipid

insipid (adj)
Tasteless.

insistence

insistence (n)
Urgency.

insistent

insistent (adj)
Urgent.

insolence

insolence (n)
Pride or haughtiness exhibited in contemptuous and overbearing treatment of others.

insolent

insolent (adj)
Impudent.

insomnia

insomnia (n)
Sleeplessness.

inspector

inspector (n)
An official appointed to examine or oversee any matter of public interest or importance.

instance

instance (n)
A single occurrence or happening of a given kind.

instant

instant (n)
A very brief portion of time.

instantaneous

instantaneous (adj)
Done without perceptible lapse of time.

instigate

instigate (v)
To provoke.

instigator

instigator (n)
One who incites to evil.

instill

instill (v)
To infuse.

instructive

instructive (adj)
Conveying knowledge.

insufficiency

insufficiency (n)
Inadequacy.

insufficient

insufficient (adj)
Inadequate for some need, purpose, or use.

insular

insular (adj)
Pertaining to an island.

insulate

insulate (v)
To place in a detached state or situation.

insuperable

insuperable (adj)
Invincible.

insuppressible

insuppressible (adj)
Incapable of being concealed.

insurgence

insurgence (n)
Uprising.

insurgent

insurgent (n)
One who takes part in forcible opposition to the constituted authorities of a place.

insurrection

insurrection (n)
The state of being in active resistance to authority.

intangible

intangible (adj)
Not perceptible to the touch.

integrity

integrity (n)
Uprightness of character and soundness of moral principle.

intellect

intellect (n)
The faculty of perception or thought.

intellectual

intellectual (adj)
Characterized by intelligence.

intelligence

intelligence (n)
Capacity to know or understand.

intelligible

intelligible (adj)
Comprehensible.

intemperance

intemperance (n)
Immoderate action or indulgence, as of the appetites.

intension

intension (n)
The act of stringing or stretching, or state of being strained.

intensive

intensive (adj)
Adding emphasis or force.

intention

intention (n)
That upon which the mind is set.

interact

interact (v)
To act reciprocally.

intercede

intercede (v)
To mediate between persons.

intercept

intercept (v)
To interrupt the course of.

intercession

intercession (n)
Entreaty in behalf of others.

intercessor

intercessor (n)
A mediator.

interdict

interdict (n)
Authoritative act of prohibition.

interim

interim (n)
Time between acts or periods.

interlocutor

interlocutor (n)
One who takes part in a conversation or oral discussion.

interlude

interlude (n)
An action or event considered as coming between others of greater length.

intermediate

intermediate (adj)
Being in a middle place or degree or between extremes.

interminable

interminable (adj)
Having no limit or end.

intermission

intermission (n)
A recess.

intermit

intermit (v)
To cause to cease temporarily.

intermittent

intermittent (adj)
A temporary discontinuance.

interpolation

interpolation (n)
Verbal interference.

interpose

interpose (v)
To come between other things or persons.

interposition

interposition (n)
A coming between.

interpreter

interpreter (n)
A person who makes intelligible the speech of a foreigner by oral translation.

interrogate

interrogate (v)
To examine formally by questioning.

interrogative

interrogative (adj)
Having the nature or form of a question.

interrogatory

interrogatory (n)
A question or inquiry.

interrupt

interrupt (v)
To stop while in progress.

intersect

intersect (v)
To cut through or into so as to divide.

intervale

intervale (n)
A low tract of land between hills, especially along a river.

intervene

intervene (v)
To interfere for some end.

intestacy

intestacy (n)
The condition resulting from one's dying not having made a valid will.

intestate

intestate (adj)
Not having made a valid will.

intestine

intestine (n)
That part of the digestive tube below or behind the stomach, extending to the anus.

intimacy

intimacy (n)
Close or confidential friendship.

intimidate

intimidate (v)
To cause to become frightened.

intolerable

intolerable (adj)
Insufferable.

intolerance

intolerance (n)
Inability or unwillingness to bear or endure.

intolerant

intolerant (adj)
Bigoted.

intoxicant

intoxicant (n)
Anything that unduly exhilarates or excites.

intoxicate

intoxicate (v)
To make drunk.

intracellular

intracellular (adj)
Occurring or situated within a cell.

intramural

intramural (adj)
Situated within the walls of a city.

intrepid

intrepid (adj)
Fearless and bold.

intricacy

intricacy (n)
Perplexity.

intricate

intricate (adj)
Difficult to follow or understand.

intrigue

intrigue (n)
A plot or scheme, usually complicated and intended to accomplish something by secret ways.

intrinsic

intrinsic (adj)
Inherent.

introductory

introductory (adj)
Preliminary.

introgression

introgression (n)
Entrance.

intromit

intromit (v)
To insert.

introspect

introspect (v)
To look into.

introspection

introspection (n)
The act of observing and analyzing one's own thoughts and feelings.

introversion

introversion (n)
The act of turning or directing inward, physically or mentally.

introvert

introvert (v)
To turn within.

intrude

intrude (v)
To come in without leave or license.

intrusion

intrusion (n)
The act of entering without warrant or invitation; encroachment.

intuition

intuition (n)
Instinctive knowledge or feeling.

inundate

inundate (v)
To fill with an overflowing abundance.

inundation

inundation (n)
Flood.

inure

inure (v)
To harden or toughen by use, exercise, or exposure.

invalid

invalid (adj)
Having no force, weight, or cogency.

invalid

invalid (n)
One who is disabled by illness or injury.