VocabularyCentral.com - vocabulary words
  • 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