Synonyms|551Antonyms|169|Broader|5Narrower|2Related|871
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forbidden
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formidable
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freakish
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groundless
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hard to believe(expression, idiom)
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hazardous
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iffy
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illegitimate
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imcomprehensible(reasonable, common)
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implausibly
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impossibly
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improbably
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inadmissible
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incogitable(reasonable, common)
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incoherent
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inconceivably
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inconsequent
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inconsequential
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incredibly
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incredulous
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APASmart Define. (2015). plausible thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/plausible/thesaurus/antonyms
ChicagoSmart Define. 2015. "plausible thesaurus" https://smartdefine.org/plausible/thesaurus/antonyms (accessed September 24, 2026).
HarvardSmart Define 2015, plausible thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/plausible/thesaurus/antonyms>.
MLASmart Define. "plausible thesaurus" 10 April 2015. Web. 24 September 2026. <https://smartdefine.org/plausible/thesaurus/antonyms>