| impolite | (adjective) not polite | - |
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| impolitic | (adjective) not politic | - |
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| imponderable | (adjective) difficult or impossible to evaluate with precision | - |
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| important | (adjective) of great significance or value | Synonyms: of import |
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| (adjective) of extreme importance; vital to the resolution of a crisis | Synonyms: crucial |
| (adjective) important in effect or meaning | Synonyms: significant |
| (adjective) having or suggesting a consciousness of high position | - |
| (adjective) having authority or ascendancy or influence | Synonyms: authoritative |
| imported | (adjective) used of especially merchandise brought from a foreign source | - |
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| importunate | (adjective) persistent to the point of annoying | - |
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| (adjective) expressing persistant and earnest entreaty | - |
| imposed | (adjective) set forth authoritatively as obligatory | - |
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| imposing | (adjective) used of a person's appearance or behavior; befitting an eminent person | Synonyms: distinguished, grand, magisterial |
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| (adjective) impressive in size, manner, or appearance | Synonyms: baronial, noble, stately |
| impossible | (adjective) not capable of occurring or being accomplished or dealt with | - |
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| (adjective) (used of persons or their behavior) not acceptable or reasonable | Synonyms: unacceptable |
| (adjective) totally unlikely | Synonyms: inconceivable, out of the question, unimaginable |
| impotent | (adjective) lacking power or ability | - |
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| (adjective) (of a male) unable to copulate | - |
| impoverished | (adjective) destroyed financially | Synonyms: broken, wiped out |
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| (adjective) poor enough to need help from others | Synonyms: destitute, indigent, necessitous, needy, poverty-stricken |