Synonyms|325Antonyms|151|Broader|5Narrower|3Related|712
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indeterminate
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insoluble
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insolvable
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insuperable
0
insupposable(reasonable, common)
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invented
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laughable
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little known(expression, unexceptional)
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ludicrous
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made-up
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make-believe
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marvellous
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murky
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mythical
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nebulous
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nonrealistic
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not applicable(expression, sensible)
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not sensible(expression, sensible)
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notional
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out-of-sight(bad, plain)
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APASmart Define. (2015). believable thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/believable/thesaurus/antonyms
ChicagoSmart Define. 2015. "believable thesaurus" https://smartdefine.org/believable/thesaurus/antonyms (accessed September 27, 2026).
HarvardSmart Define 2015, believable thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/believable/thesaurus/antonyms>.
MLASmart Define. "believable thesaurus" 14 April 2015. Web. 27 September 2026. <https://smartdefine.org/believable/thesaurus/antonyms>