Synonyms|150Antonyms|1|Broader|0Narrower|0Related|0
7
mad(adjective, insane)
6
crazy(adjective, insane)
6
insane(adjective, insane)
5
batty(adjective, insane)
5
nutty(adjective, insane)
4
barmy
4
cuckoo
4
daft
4
demented(adjective, insane)
4
irrational(adjective, insane)
4
loony
3
balmy
3
deranged(adjective, insane)
3
dotty
3
lunatic(adjective, insane)
3
nuts
3
screwy
3
unbalanced(adjective, insane)
2
asinine
2
bats
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APASmart Define. (2013). crack-brained thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/crack-brained/thesaurus/synonyms
ChicagoSmart Define. 2013. "crack-brained thesaurus" https://smartdefine.org/crack-brained/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2013, crack-brained thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/crack-brained/thesaurus/synonyms>.
MLASmart Define. "crack-brained thesaurus" 17 June 2013. Web. 20 September 2026. <https://smartdefine.org/crack-brained/thesaurus/synonyms>