- Definitions|0
- Thesaurus|60
- Abbreviations|0
| sick in the head(expression, idiom, crazy, sick, lunatic) | |
| stark raving mad(expression, idiom, crazy, sick, off) | |
| unsound(adjective, crazy, sick, sane) | |
| bananas(adjective, sane) | |
| bonkers(adjective, sane) | |
| daffy(adjective, sane) | |
| eccentric(off, dotty) | |
| ma(adjective, mad, insane, irrational, distraught) | |
| maniacal(adjective, sane) | |
| non compos mentis(adjective, law, sane) | |
| nuts(adjective, sane) | |
| nutty(adjective, sane) | |
| nutty as fruitcake(expression, sick, hacked, lunatic, crackbrained) | |
| screwy(adjective, sane) | |
| touched(adjective, sane) | |
| unbalanced(adjective, sane) | |
| wacky(adjective, sane) | |
| wrong(adjective, sane) |
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| APA | Smart Define. (2011). crazy as a loon thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/crazy_as_a_loon/thesaurus/synonyms |
| Chicago | Smart Define. 2011. "crazy as a loon thesaurus" https://smartdefine.org/crazy_as_a_loon/thesaurus/synonyms (accessed September 26, 2026). |
| Harvard | Smart Define 2011, crazy as a loon thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/crazy_as_a_loon/thesaurus/synonyms>. |
| MLA | Smart Define. "crazy as a loon thesaurus" 23 May 2011. Web. 26 September 2026. <https://smartdefine.org/crazy_as_a_loon/thesaurus/synonyms> |