Synonyms|477Antonyms|139|Broader|3Narrower|8Related|879
17
unbelievable(adjective, unsound, plausible)
15
incredible(adjective, bad, unsound, unbelievable, unremarkable)
12
improbable(adjective, unsound, unbelievable)
10
unlikely(adjective, reasonable, unsound, likely, unbelievable)
5
ludicrous
3
impossible(adjective, unsound, unbelievable)
3
tall
2
suspect
2
unsustainable
2
untrustworthy(adjective, unsound, unbelievable)
1
implausible(adjective, reasonable, unsound, unbelievable, plausible)
1
uncertain
1
undependable(adjective, unsound, unbelievable)
1
undreamed
1
undreamed of
1
undreamt
1
unimagined
1
unreliable(adjective, unsound, unbelievable)
1
unsound(adjective, unbelievable)
0
inconceivable(adjective, reasonable, unsound, unbelievable, imaginable)
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APASmart Define. (2015). credible thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/credible/thesaurus/antonyms
ChicagoSmart Define. 2015. "credible thesaurus" https://smartdefine.org/credible/thesaurus/antonyms (accessed September 23, 2026).
HarvardSmart Define 2015, credible thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/credible/thesaurus/antonyms>.
MLASmart Define. "credible thesaurus" 10 April 2015. Web. 23 September 2026. <https://smartdefine.org/credible/thesaurus/antonyms>