| whacky | |
| wrong(adjective, foolish, unreasonable, sane, illogical) | |
| zealot(noun, person, crazy, nut, fanatic) | |
| bugs | |
| cockamamie(adjective, weak, simple, wrong, silly) | |
| dim-witted(adjective, foolish) | |
| doltish(adjective, weak, simple, careless, silly) | |
| fatuitous | |
| flake(noun, slang, sick, mad person) | |
| ignorant(adjective, foolish, impractical, half-baked, doomed) | |
| infatuated | |
| madcap(noun, adjective, person, silly, crazy) | |
| moron(noun, person) | |
| odd(adjective, wild, strange, silly, foolish) | |
| oddball | |
| off(adjective, sane) | |
| off one's rocker(adjective, idiom, sane) | |
| queer | |
| rabid(adjective, crazy, mad, odd, insane) | |
| rash(adjective, crazy, mad, odd, insane) |
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| APA | Smart Define. (2015). loony thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/loony/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "loony thesaurus" https://smartdefine.org/loony/thesaurus/synonyms (accessed September 24, 2026). |
| Harvard | Smart Define 2015, loony thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/loony/thesaurus/synonyms>. |
| MLA | Smart Define. "loony thesaurus" 10 April 2015. Web. 24 September 2026. <https://smartdefine.org/loony/thesaurus/synonyms> |