An idiot, dolt, or dullard is a mentally deficient person, or someone who acts in a self-defeating or significantly counterproductive way. More humorous synonyms of the term include addlehead, blockhead, bonehead, deadhead, dimwit, dodo, dope, dummy, dunderhead, nincompoop, ninny, nitwit, numbskull, stupidhead, thickhead, and twit, among many others. Archaically the word mome has also been used.
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idiot A person with poor judgment or little intelligence.
