| inane | |
| insensate | |
| invalid(foolish, fantastic) | |
| looney | |
| ludicrous(foolish, fantastic) | |
| luny | |
| mad as a hatter(adjective, idiom, law, sane) | |
| moronic | |
| nobody home(expression, unstable, disturbed, erratic, unhinged) | |
| nonsensical(foolish, fantastic) | |
| not right upstairs | |
| nutsy(mad, insane, psychiatric) | |
| nutty as fruitcake(expression, idiom, crazy, hysterical, psychotic) | |
| off one's head(adjective, idiom, law, sane) | |
| off rocker | |
| off the rails | |
| out of head | |
| out of it | |
| out of one's mind(adjective, idiom, law, sane) | |
| overenthusiastic person(noun, expression, crazy, loony) |
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| APA | Smart Define. (2015). non compos mentis thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/non_compos_mentis/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "non compos mentis thesaurus" https://smartdefine.org/non_compos_mentis/thesaurus/synonyms (accessed September 28, 2026). |
| Harvard | Smart Define 2015, non compos mentis thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/non_compos_mentis/thesaurus/synonyms>. |
| MLA | Smart Define. "non compos mentis thesaurus" 10 April 2015. Web. 28 September 2026. <https://smartdefine.org/non_compos_mentis/thesaurus/synonyms> |