| idiographic | (adjective) relating to or involving the study of individuals | - |
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| idiomatic | (adjective) of or relating to or conforming to idiom | Synonyms: idiomatical |
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| idiomatical | (adjective) of or relating to or conforming to idiom | Synonyms: idiomatic |
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| idiopathic | (adjective) (of diseases) arising from an unknown cause | - |
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| idiosyncratic | (adjective) peculiar to the individual | - |
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| idiotic | (adjective) so unreasonable as to invite derision | Synonyms: absurd, cockeyed, derisory, laughable, ludicrous, nonsensical, preposterous, ridiculous |
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| (adjective) insanely irresponsible | Synonyms: crackbrained |
| (adjective) having a mental age of three to seven years | Synonyms: imbecile, imbecilic |