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- 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.
- jargon n. Confused, unintelligible speech or highly technical speech.
- jaundice n. A morbid condition, due to obstructed excretion of bile
or characterized by yellowing of the skin.
- jeopardize v. To imperil.
- Jingo n. One of a party in Great Britain in favor of spirited and
demonstrative foreign policy
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