12 entries under sound topic. ×
| foolish(adjective, wise, unsound, nonsensical) | |
| insane | |
| irrational(adjective, foolish, rational, senseless) | |
| aper | |
| bats in the belfry(expression, idiom, calm) | |
| mad as a March hare(expression, idiom, calm) | |
| mad as a hatter(expression, idiom, calm) | |
| nutty as fruitcake(expression, idiom, calm) | |
| of unsound mind(expression, idiom, calm) | |
| round the bend(expression, idiom, calm) | |
| schizo | |
| screw loose(expression, calm) |
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| APA | Smart Define. (2016). sensible thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/sensible/thesaurus/antonyms |
| Chicago | Smart Define. 2016. "sensible thesaurus" https://smartdefine.org/sensible/thesaurus/antonyms (accessed September 27, 2026). |
| Harvard | Smart Define 2016, sensible thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/sensible/thesaurus/antonyms>. |
| MLA | Smart Define. "sensible thesaurus" 29 March 2016. Web. 27 September 2026. <https://smartdefine.org/sensible/thesaurus/antonyms> |