| 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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| impudence | (noun) the trait of being rude and impertinent; inclined to take liberties | Synonyms: cheekiness, crust, freshness, gall, impertinence, insolence |
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| (noun) an impudent statement | Synonyms: cheek, impertinence |
| impudent | (adjective) marked by casual disrespect | Synonyms: flip, insolent, snotty-nosed |
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| (adjective) improperly forward or bold | Synonyms: fresh, impertinent, overbold, sassy, saucy, smart, wise |
| impudently | (adverb) in an impudent or impertinent manner | Synonyms: freshly, impertinently, pertly, saucily |
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| impugn | (verb) attack as false or wrong | - |
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| impugnable | (adjective) subject to being discredited | - |
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| impuissance | (noun) powerlessness revealed by an inability to act | Synonyms: helplessness, weakness |
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| impuissant | (adjective) lacking physical strength or vigor | - |
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| impulse | (noun) the act of applying force suddenly | Synonyms: impetus, impulsion |
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| (noun) an impelling force or strength | Synonyms: momentum |
| (noun) the electrical discharge that travels along a nerve fiber | Synonyms: nerve impulse, nervous impulse, neural impulse |
| (noun) (electronics) a sharp transient wave in the normal electrical state (or a series of such transients) | Synonyms: pulsation, pulse, pulsing |
| (noun) a sudden desire | Synonyms: caprice, whim |
| (noun) an instinctive motive | Synonyms: urge |
| impulsion | (noun) the act of applying force suddenly | Synonyms: impetus, impulse |
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| (noun) a force that moves something along | Synonyms: drift, impetus |
| impulsive | (adjective) determined by chance or impulse or whim rather than by necessity or reason | Synonyms: capricious, whimsical |
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| (adjective) having the power of driving or impelling | Synonyms: driving |
| (adjective) characterized by undue haste and lack of thought or deliberation | Synonyms: brainish, hotheaded, impetuous, madcap, tearaway |
| (adjective) proceeding from natural feeling or impulse without external stimulus | Synonyms: unprompted |
| (adjective) without forethought | - |
| impulsively | (adverb) in an impulsive or impetuous way; without taking cautions | Synonyms: impetuously |
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| impulsiveness | (noun) the trait of acting suddenly on impulse without reflection | - |
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| impunity | (noun) exemption from punishment or loss | - |
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| impure | (adjective) (used of persons or behaviors) immoral or obscene | - |
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| (adjective) combined with extraneous elements | - |
| (adjective) having a physical or moral blemish so as to make impure according to dietary or ceremonial laws | Synonyms: unclean |
| impureness | (noun) the condition of being impure | Synonyms: impurity |
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| impurity | (noun) the condition of being impure | Synonyms: impureness |
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| (noun) worthless or dangerous material that should be removed | Synonyms: dross |
| imputable | (adjective) capable of being assigned or credited to | Synonyms: ascribable, due, referable |
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| imputation | (noun) the attribution to a source or cause | - |
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| (noun) a statement attributing something dishonest (especially a criminal offense) | - |
| impute | (verb) attribute or credit to | Synonyms: ascribe, assign, attribute |
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| (verb) attribute (responsibility or fault) to a cause or source | - |
| imputrescible | (adjective) not subject to decay | - |
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