5
off-the-wall(adjective, wrong, pleasant, happy, foolish)
5
schizo(noun, adjective, slang, foolish, sick)
5
thoughtless(adjective, careless, silly, stupid, unwise)
4
blockheaded(adjective, foolish, impractical, half-baked, doomed)
4
brainsick(adjective, wrong, wild, crazy, confused)
4
crack-brained
4
ding-a-ling(noun, slang, wise, crackpot)
4
dingbat(noun, slang, wise, crackpot)
4
disordered(adjective, wrong, wild, crazy, confused)
4
half-witted(adjective, weak, simple, silly, foolish)
4
idiot
4
inept(careless, stupid, unthinking, obtuse, unperceptive)
4
jerky(adjective, light, knowledge, slang, ability)
4
laughable
4
luny(noun, adjective, slang, sick, mad person)
4
madwoman
4
meshuga
4
unearthly(adjective, knowledge, ability)
4
unsound(adjective, foolish, unreasonable, sane, illogical)
4
weirdie(noun, slang, wise)
11 years ago|25k views|share |citing 
APASmart Define. (2015). loony thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/loony/thesaurus/synonyms
ChicagoSmart Define. 2015. "loony thesaurus" https://smartdefine.org/loony/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2015, loony thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/loony/thesaurus/synonyms>.
MLASmart Define. "loony thesaurus" 10 April 2015. Web. 24 September 2026. <https://smartdefine.org/loony/thesaurus/synonyms>