4
paradoxical(adjective, absurd)
4
peculiar(adjective, unusual, strange, silly, foolish)
4
questionable(adjective, extraordinary, amazing, absurd, unbelievable)
4
rich(adjective, funny, fantastic, absurd, expensive)
4
shocking(adjective, obscure, usual, extreme, ridiculous)
4
unconvincing(adjective, extraordinary, fantastic, amazing, unbelievable)
4
unjustified
4
unrealistic(adjective, happy, false, foolish, fantastic)
4
unworkable(adjective, foolish, unreasonable, fantastic, useless)
3
barmy(adjective, careless, silly, foolish, stupid)
3
childish
3
chimerical(adjective, happy, perfect, strange, fantastic)
3
comic(adjective, silly, funny, absurd, pitiful)
3
crackpot(impractical, half-baked, doomed)
3
dumb(adjective, impractical, half-baked, doomed)
3
extortionate(adjective, offensive, unreasonable, extreme, extravagant)
3
fallacious(adjective, foolish, unreasonable, absurd, irrational)
3
foolhardy(adjective, simple, wild, strange, silly)
3
half-witted(weak, simple, silly, foolish, thoughtless)
3
humorous(adjective, funny, fantastic, absurd, amusing)
11 years ago|25k views|share |citing 
APASmart Define. (2015). preposterous thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/preposterous/thesaurus/synonyms
ChicagoSmart Define. 2015. "preposterous thesaurus" https://smartdefine.org/preposterous/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2015, preposterous thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/preposterous/thesaurus/synonyms>.
MLASmart Define. "preposterous thesaurus" 2 September 2015. Web. 21 September 2026. <https://smartdefine.org/preposterous/thesaurus/synonyms>