6
dubious(adjective, extraordinary, fantastic, amazing, ridiculous)
6
egregious(adjective, bad, extreme, immoral, shocking)
6
extraordinary(adjective, amazing, incredible)
6
fabulous(adjective, severe, harsh, false, exceptional)
6
fanciful(adjective, happy, perfect, strange, fantastic)
6
far-fetched(adjective, hard, great, extraordinary, strange)
6
inconsistent(adjective, foolish, stupid, senseless, absurd)
6
lunatic(adjective, weak, simple, knowledge, ability)
6
meaningless(adjective, absurd)
6
screwy(adjective, great, wrong, extraordinary, wild)
6
tomfool(adjective, knowledge, ability, foolish)
6
undue(adjective, wrong, false, awkward, unreasonable)
6
unwarranted(adjective, wrong, false, awkward, unreasonable)
5
sappy(adjective, knowledge, slang, ability, foolish)
5
amusing(adjective, silly, funny, fantastic, absurd)
5
cuckoo(adjective, silly, foolish, stupid, unwise)
5
erratic(adjective, wrong, wild, strange, silly)
5
exaggerated(adjective, hard, severe, difficult, harsh)
5
imbecile
5
impractical(adjective, wrong, happy, wild, stupid)
11 years ago|25k views|share |citing 
APASmart Define. (2015). preposterous thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/preposterous/thesaurus/synonyms
ChicagoSmart Define. 2015. "preposterous thesaurus" https://smartdefine.org/preposterous/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2015, preposterous thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/preposterous/thesaurus/synonyms>.
MLASmart Define. "preposterous thesaurus" 2 September 2015. Web. 20 September 2026. <https://smartdefine.org/preposterous/thesaurus/synonyms>