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Synonyms
fantastic (also fantastical), implausible, inconceivable, incredible, incredulous, unbelievable, uncompelling, unconvincing, unimaginable, unthinkable
Antonyms
believable, cogitable, conceivable, convincing, credible, creditable, imaginable, plausible, supposable, thinkable
circa 1604, in the meaning defined above
More from Merriam-Webster on unconceivable
Rhyming Dictionary: Words that rhyme with unconceivable
Thesaurus: All synonyms and antonyms for unconceivable
See Definitions and Examples
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