| impracticability | (noun) the quality of not being usable | Synonyms: impracticableness |
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| impracticable | (adjective) not capable of being carried out or put into practice | Synonyms: infeasible, unfeasible, unworkable |
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| impracticableness | (noun) the quality of not being usable | Synonyms: impracticability |
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| impracticably | (adverb) to an impracticable degree | - |
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| impractical | (adjective) not practical; not workable or not given to practical matters | - |
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| (adjective) not practical or realizable; speculative | Synonyms: airy, Laputan, visionary, windy |
| impracticality | (noun) concerned with theoretical possibilities rather than actual use | - |
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| imprecate | (verb) utter obscenities or profanities | Synonyms: blaspheme, curse, cuss, swear |
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| (verb) wish harm upon; invoke evil upon | Synonyms: anathemise, anathemize, bedamn, beshrew, curse, damn, maledict |
| imprecation | (noun) the act of calling down a curse that invokes evil (and usually serves as an insult) | Synonyms: malediction |
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| (noun) a slanderous accusation | - |
| imprecise | (adjective) not precise | - |
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| imprecisely | (adverb) in an imprecise manner | Synonyms: inexactly |
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| impreciseness | (noun) the quality of lacking precision | Synonyms: imprecision |
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| imprecision | (noun) the quality of lacking precision | Synonyms: impreciseness |
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| impregnability | (noun) having the strength to withstand attack | Synonyms: invulnerability |
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| impregnable | (adjective) capable of conceiving | Synonyms: conceptive |
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| (adjective) immune to attack; incapable of being tampered with | Synonyms: inviolable, secure, strong, unassailable, unattackable |
| (adjective) incapable of being overcome, challenged or refuted | Synonyms: inexpugnable |
| impregnably | (adverb) in an impregnable manner | - |
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| impregnate | (verb) make pregnant | Synonyms: bang up, knock up, prang up |
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| (verb) fertilize and cause to grow | - |
| (verb) infuse or fill completely | Synonyms: saturate |
| (verb) fill, as with a certain quality | Synonyms: infuse, instill, tincture |
| impregnation | (noun) creation by the physical union of male and female gametes; of sperm and ova in an animal or pollen and ovule in a plant | Synonyms: fecundation, fertilisation, fertilization |
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| (noun) the process of totally saturating something with a substance | Synonyms: saturation |
| (noun) material with which something is impregnated | - |
| impresario | (noun) a sponsor who books and stages public entertainments | Synonyms: promoter, showman |
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| impress | (noun) the act of coercing someone into government service | Synonyms: impressment |
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| (verb) dye (fabric) before it is spun | Synonyms: yarn-dye |
| (verb) produce or try to produce a vivid impression of | Synonyms: ingrain, instill |
| (verb) mark or stamp with or as if with pressure | Synonyms: imprint |
| (verb) take (someone) against his will for compulsory service, especially on board a ship | Synonyms: shanghai |
| (verb) reproduce by printing | Synonyms: print |
| (verb) impress positively | - |
| (verb) have an emotional or cognitive impact upon | Synonyms: affect, move, strike |
| impressed | (adjective) deeply or markedly affected or influenced | - |
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| impressible | (adjective) easily impressed or influenced | Synonyms: impressionable, waxy |
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| impression | (noun) an impressionistic portrayal of a person | - |
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| (noun) the act of pressing one thing on or into the surface of another | - |
| (noun) (dentistry) an imprint of the teeth and gums in wax or plaster | - |
| (noun) an outward appearance | Synonyms: effect |
| (noun) a vague idea in which some confidence is placed | Synonyms: belief, feeling, notion, opinion |
| (noun) a clear and telling mental image | Synonyms: mental picture, picture |
| (noun) a symbol that is the result of printing or engraving | Synonyms: stamp |
| (noun) all the copies of a work printed at one time | Synonyms: printing |
| (noun) a concavity in a surface produced by pressing | Synonyms: depression, imprint |
| impressionable | (adjective) easily impressed or influenced | Synonyms: impressible, waxy |
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| impressionist | (adjective) relating to or characteristic of Impressionism | Synonyms: impressionistic |
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| (noun) an artist who follows the theories of Impressionism | - |
| impressionistic | (adjective) relating to or characteristic of Impressionism | Synonyms: impressionist |
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| (adjective) of or relating to or based on an impression rather than on facts or reasoning | - |
| impressive | (adjective) making a strong or vivid impression | - |
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| (adjective) producing a strong effect | Synonyms: telling |
| impressively | (adverb) in an impressive manner | Synonyms: imposingly |
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| impressiveness | (noun) splendid or imposing in size or appearance | Synonyms: grandness, magnificence, richness |
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| (noun) the quality of making a strong or vivid impression on the mind | - |
| impressment | (noun) the act of coercing someone into government service | Synonyms: impress |
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| imprimatur | (noun) formal and explicit approval | Synonyms: countenance, endorsement, indorsement, sanction, warrant |
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| imprint | (noun) a device produced by pressure on a surface | - |
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| (noun) a distinctive influence | - |
| (noun) an impression produced by pressure or printing | Synonyms: embossment |
| (noun) an identification of a publisher; a publisher's name along with the date and address and edition that is printed at the bottom of the title page | - |
| (noun) a concavity in a surface produced by pressing | Synonyms: depression, impression |
| (verb) mark or stamp with or as if with pressure | Synonyms: impress |
| (verb) establish or impress firmly in the mind | Synonyms: form |
| imprinting | (noun) a learning process in early life whereby species specific patterns of behavior are established | - |
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| imprison | (verb) lock up or confine, in or as in a jail | Synonyms: gaol, immure, incarcerate, jail, jug, lag, put away, put behind bars, remand |
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| (verb) confine as if in a prison | - |
| imprisoned | (adjective) being in captivity | Synonyms: captive, confined, jailed |
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| imprisonment | (noun) the act of confining someone in a prison (or as if in a prison) | Synonyms: internment |
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| (noun) putting someone in prison or in jail as lawful punishment | - |
| (noun) the state of being imprisoned | Synonyms: captivity, immurement, incarceration |
| improbability | (noun) the quality of being improbable | Synonyms: improbableness |
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| improbable | (adjective) not likely to be true or to occur or to have occurred | Synonyms: unlikely |
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| (adjective) having a probability too low to inspire belief | Synonyms: unbelievable, unconvincing, unlikely |
| (adjective) too improbable to admit of belief | Synonyms: marvellous, marvelous, tall |
| improbableness | (noun) the quality of being improbable | Synonyms: improbability |
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| improbably | (adverb) not easy to believe | Synonyms: implausibly, incredibly, unbelievably |
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| impromptu | (adjective) with little or no preparation or forethought | Synonyms: ad-lib, extemporaneous, extemporary, extempore, off-the-cuff, offhand, offhanded, unrehearsed |
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| (noun) an extemporaneous speech or remark | - |
| (noun) a short musical passage that seems to have been made spontaneously without advance preparation | - |
| (adverb) without advance preparation | Synonyms: ad lib, ad libitum, spontaneously |
| improper | (adjective) not suitable or right or appropriate | - |
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| (adjective) not appropriate for a purpose or occasion | Synonyms: wrong |
| (adjective) not conforming to legality, moral law, or social convention | Synonyms: unconventional, unlawful |
| improperly | (adverb) in an improper way | - |
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| improperness | (noun) an improper demeanor | Synonyms: impropriety |
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| impropriety | (noun) an act of undue intimacy | Synonyms: familiarity, indecorum, liberty |
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| (noun) an indecent or improper act | Synonyms: indecency |
| (noun) an improper demeanor | Synonyms: improperness |
| (noun) the condition of being improper | - |
| improvable | (adjective) susceptible of improvement | - |
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| improve | (verb) get better | Synonyms: ameliorate, better, meliorate |
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| (verb) to make better | Synonyms: ameliorate, amend, better, meliorate |
| improved | (adjective) made more desirable or valuable or profitable; especially made ready for use or marketing | - |
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| (adjective) become or made better in quality | - |
| (adjective) (of land) made ready for development or agriculture by clearing of trees and brush | - |
| improvement | (noun) the act of improving something | - |
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| (noun) a change for the better; progress in development | Synonyms: advance, betterment |
| (noun) a condition superior to an earlier condition | Synonyms: melioration |
| improver | (noun) a component that is added to something to improve it | Synonyms: add-on, addition |
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| (noun) someone devoted to the promotion of human welfare and to social reforms | Synonyms: do-gooder, humanitarian |
| improvidence | (noun) a lack of prudence and care by someone in the management of resources | Synonyms: shortsightedness |
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| improvident | (adjective) not provident; not providing for the future | - |
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| (adjective) not given careful consideration | Synonyms: ill-considered, ill-judged, shortsighted |
| improvidently | (adverb) in an improvident manner | - |
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| improving | (adjective) getting higher or more vigorous | Synonyms: up |
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| improvisation | (noun) an unplanned expedient | Synonyms: temporary expedient |
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| (noun) a performance given extempore without planning or preparation | Synonyms: extemporisation, extemporization |
| (noun) a creation spoken or written or composed extemporaneously (without prior preparation) | - |
| improvise | (verb) perform without preparation | Synonyms: ad-lib, extemporise, extemporize, improvize |
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| (verb) manage in a makeshift way; do with whatever is at hand | Synonyms: extemporize |
| improvised | (adjective) done or made using whatever is available | Synonyms: jury-rigged, makeshift |
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| improvize | (verb) perform without preparation | Synonyms: ad-lib, extemporise, extemporize, improvise |
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| imprudence | (noun) a lack of caution in practical affairs | - |
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| imprudent | (adjective) not prudent or wise | - |
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| (adjective) lacking wise self-restraint | - |
| imprudently | (adverb) in an imprudent manner | - |
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