| idiocy | (noun) extreme mental retardation | Synonyms: amentia |
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| idiographic | (adjective) relating to or involving the study of individuals | - |
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| idiolatry | (noun) the worship of yourself | Synonyms: autolatry, self-worship |
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| idiolect | (noun) the language or speech of one individual at a particular period in life | - |
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| idiom | (noun) the style of a particular artist or school or movement | Synonyms: artistic style |
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| (noun) the usage or vocabulary that is characteristic of a specific group of people | Synonyms: accent, dialect |
| (noun) an expression whose meanings cannot be inferred from the meanings of the words that make it up | Synonyms: idiomatic expression, phrasal idiom, phrase, set phrase |
| (noun) a manner of speaking that is natural to native speakers of a language | Synonyms: parlance |
| 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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| idiomatically | (adverb) in an idiomatic manner | - |
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| idiopathic | (adjective) (of diseases) arising from an unknown cause | - |
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| idiopathy | (noun) any disease arising from internal dysfunctions of unknown cause | Synonyms: idiopathic disease, idiopathic disorder |
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| idiosyncrasy | (noun) a behavioral attribute that is distinctive and peculiar to an individual | Synonyms: foible, mannerism |
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| idiosyncratic | (adjective) peculiar to the individual | - |
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| idiot | (noun) a person of subnormal intelligence | Synonyms: changeling, cretin, half-wit, imbecile, moron, retard |
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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 |
| idiotically | (adverb) in an idiotic manner | - |
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