| 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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