| impracticability | (noun) the quality of not being usable | Synonyms: impracticableness |
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| impracticableness | (noun) the quality of not being usable | Synonyms: impracticability |
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| impracticality | (noun) concerned with theoretical possibilities rather than actual use | - |
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| 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 | - |
| 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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| 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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| 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 |
| impressionist | (noun) an artist who follows the theories of Impressionism | - |
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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 |
| imprinting | (noun) a learning process in early life whereby species specific patterns of behavior are established | - |
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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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| improbableness | (noun) the quality of being improbable | Synonyms: improbability |
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| impromptu | (noun) an extemporaneous speech or remark | - |
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| (noun) a short musical passage that seems to have been made spontaneously without advance preparation | - |
| 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 | - |
| 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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| 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) | - |
| imprudence | (noun) a lack of caution in practical affairs | - |
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