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5
believable(adjective, unreasonable, unbelievable)
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APASmart Define. (2015). unthinkable thesaurus. Retrieved October 1, 2026, from https://smartdefine.org/unthinkable/thesaurus/antonyms
ChicagoSmart Define. 2015. "unthinkable thesaurus" https://smartdefine.org/unthinkable/thesaurus/antonyms (accessed October 1, 2026).
HarvardSmart Define 2015, unthinkable thesaurus, Smart Define, viewed 1 October, 2026, <https://smartdefine.org/unthinkable/thesaurus/antonyms>.
MLASmart Define. "unthinkable thesaurus" 14 April 2015. Web. 1 October 2026. <https://smartdefine.org/unthinkable/thesaurus/antonyms>