17
farcical(adjective, strange, funny, ridiculous, absurd)
17
outlandish(adjective, hard, unusual, strange, ridiculous)
16
implausible(adjective, hard, great, difficult, extraordinary)
16
irrational(adjective, weak, simple, wrong, severe)
15
asinine(adjective, weak, simple, foolish, stupid)
14
fatuous(adjective, wrong, wild, foolish, stupid)
14
half-assed
14
inane(adjective, foolish, stupid, fantastic, senseless)
14
risible(adjective, funny, fantastic, absurd, amusing)
14
unbelievable(adjective, hard, great, obscure, difficult)
13
imbecilic(adjective, weak, simple, knowledge, ability)
12
exorbitant(adjective, hard, difficult, offensive, unreasonable)
12
impossible(adjective, false, ridiculous, absurd, bizarre)
12
moronic(adjective, weak, simple, knowledge, ability)
12
nutty(adjective, weak, simple, wrong, wild)
11
excessive(adjective, severe, harsh, offensive, false)
10
illogical(adjective, strange, sense, stupid, unreasonable)
10
loony(adjective, weak, simple, wrong, knowledge)
10
unconscionable(adjective, offensive, usual, unreasonable, extreme)
10
unthinkable(adjective, unusual, unreasonable, useless, ridiculous)
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>