97 entries under noun topic. ×
| non compos mentis(expression, adjective, idiom, law) | |
| eccentric(adjective, wild, strange, silly) | |
| loon(slang, informal, sick, wise) | |
| nutter(slang, sick, mad person) | |
| freak(person, crazy, nut, fanatic) | |
| looney | |
| not all there(adjective, idiom, slang, sick) | |
| nutcase(slang, sick, mad person) | |
| psychopath(person, madness, insanity, psycho) | |
| crank(informal, crazy, wise) | |
| schizo(adjective, slang, foolish, sick) | |
| ding-a-ling(slang, wise, crackpot) | |
| dingbat(slang, wise, crackpot) | |
| luny(adjective, slang, sick, mad person) | |
| madwoman | |
| weirdie(slang, wise) | |
| zealot(person, crazy, nut, fanatic) | |
| flake(slang, sick, mad person) | |
| madcap(adjective, person, silly, crazy) | |
| moron |
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| APA | Smart Define. (2015). loony thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/loony/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "loony thesaurus" https://smartdefine.org/loony/thesaurus/synonyms (accessed September 29, 2026). |
| Harvard | Smart Define 2015, loony thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/loony/thesaurus/synonyms>. |
| MLA | Smart Define. "loony thesaurus" 10 April 2015. Web. 29 September 2026. <https://smartdefine.org/loony/thesaurus/synonyms> |