| 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 |
| impuissance | (noun) powerlessness revealed by an inability to act | Synonyms: helplessness, weakness |
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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 |
| 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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| 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 |
| imputation | (noun) the attribution to a source or cause | - |
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| (noun) a statement attributing something dishonest (especially a criminal offense) | - |