Synonyms|477Antonyms|139|Broader|3Narrower|8Related|879
0
unimaginable(adjective, unsound, unbelievable)
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unthinkable(adjective, unusual, incredible)
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far-fetched
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unconvincing
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doubtful
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dubious
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fantastic
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preposterous
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questionable
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unreasonable(adjective, unsound, unbelievable)
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untenable(adjective, unsound, unbelievable)
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absurd
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astounding
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derisory
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dumbfounding
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dumfounding
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fabulous
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flimsy
0
hopeless
0
incredulous
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ChicagoSmart Define. 2015. "credible thesaurus" https://smartdefine.org/credible/thesaurus/antonyms (accessed September 25, 2026).
HarvardSmart Define 2015, credible thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/credible/thesaurus/antonyms>.
MLASmart Define. "credible thesaurus" 10 April 2015. Web. 25 September 2026. <https://smartdefine.org/credible/thesaurus/antonyms>