12
wacky(adjective, slang, silly, foolish, crazy)
11
bats(adjective, crazy)
11
cracked(adjective, informal, silly, foolish, crazy)
11
daffy(adjective, slang, informal, crazy, mad)
11
kooky(adjective, silly, foolish, crazy, mad)
11
loopy
11
touched(adjective, silly, foolish, crazy, mad)
10
fruity(adjective, slang, informal, silly, foolish)
10
mental(adjective, simple, silly, foolish, mad)
9
haywire(adjective, informal, crazy, broken)
9
psychotic
9
round the bend(expression, adjective, idiom, silly, foolish)
9
unhinged(adjective, silly, crazy, mad, insane)
8
buggy(adjective, slang, sane)
8
gaga(adjective, informal, crazy, sane)
8
non compos mentis(adjective, law, sane)
8
of unsound mind(expression, adjective, idiom, silly, mad)
7
brainsick(adjective, informal, insane, sane)
7
certifiable
7
crazed(adjective, wild, silly, foolish, crazy)
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APASmart Define. (2015). bonkers thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/bonkers/thesaurus/synonyms
ChicagoSmart Define. 2015. "bonkers thesaurus" https://smartdefine.org/bonkers/thesaurus/synonyms (accessed September 26, 2026).
HarvardSmart Define 2015, bonkers thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/bonkers/thesaurus/synonyms>.
MLASmart Define. "bonkers thesaurus" 10 April 2015. Web. 26 September 2026. <https://smartdefine.org/bonkers/thesaurus/synonyms>