| not all there(expression, adjective, idiom, crazy, sick) | |
| off(adjective, insane, sane, dotty) | |
| unsound(adjective, crazy, mad, sick, insane) | |
| wacky(adjective, slang, sane) | |
| certifiable | |
| haywire | |
| kookie | |
| maniacal(adjective, insane, sane) | |
| wacko | |
| around the bend(expression, adjective, idiom, insane, sane) | |
| disordered(adjective, crazy, insane, irrational, sane) | |
| gaga(adjective, informal, sane) | |
| off one's rocker(adjective, idiom, insane, sane) | |
| psycho | |
| unsettled(adjective, crazy, insane, irrational, distracted) | |
| cockamamie(adjective, slang, crazy, mad) | |
| crackpot | |
| meshuga | |
| potty | |
| round the bend(expression, adjective, idiom) |
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| APA | Smart Define. (2015). loco thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/loco/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "loco thesaurus" https://smartdefine.org/loco/thesaurus/synonyms (accessed September 24, 2026). |
| Harvard | Smart Define 2015, loco thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/loco/thesaurus/synonyms>. |
| MLA | Smart Define. "loco thesaurus" 10 April 2015. Web. 24 September 2026. <https://smartdefine.org/loco/thesaurus/synonyms> |