50 entries under insane topic. ×

12
lunatic(noun, adjective, wild, silly, foolish)
10
cuckoo(noun, adjective, slang, silly, crazy)
8
nutty(adjective, silly, foolish, crazy, mad)
7
kooky(adjective, slang, silly, foolish, crazy)
7
mad(adjective, silly, foolish, crazy)
7
screwy(adjective, silly, foolish, crazy, mad)
6
nuts(noun, adjective, slang, silly, mad)
6
psycho(noun, slang, silly, mad, sick)
5
daft(adjective, silly, foolish, crazy, mad)
5
dippy(adjective, silly, foolish, mad)
5
erratic(adjective, silly, foolish, mad, usual)
5
wacky(adjective, silly, foolish, crazy, mad)
4
barmy(adjective, silly, foolish, crazy, mad)
4
flaky(adjective, silly, foolish, crazy, mad)
4
potty(adjective, silly, foolish, mad)
4
silly(adjective, foolish, crazy, mad)
4
unbalanced(adjective, silly, foolish, crazy, mad)
4
unhinged(adjective, silly, foolish, mad)
3
batty(adjective, silly, foolish, crazy, mad)
3
bonkers(adjective, silly, foolish, crazy, mad)
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APASmart Define. (2015). screwball thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/screwball/thesaurus/synonyms
ChicagoSmart Define. 2015. "screwball thesaurus" https://smartdefine.org/screwball/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2015, screwball thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/screwball/thesaurus/synonyms>.
MLASmart Define. "screwball thesaurus" 10 April 2015. Web. 27 September 2026. <https://smartdefine.org/screwball/thesaurus/synonyms>