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APASmart Define. (2013). unbelievably thesaurus. Retrieved September 30, 2026, from https://smartdefine.org/unbelievably/thesaurus/antonyms
ChicagoSmart Define. 2013. "unbelievably thesaurus" https://smartdefine.org/unbelievably/thesaurus/antonyms (accessed September 30, 2026).
HarvardSmart Define 2013, unbelievably thesaurus, Smart Define, viewed 30 September, 2026, <https://smartdefine.org/unbelievably/thesaurus/antonyms>.
MLASmart Define. "unbelievably thesaurus" 28 June 2013. Web. 30 September 2026. <https://smartdefine.org/unbelievably/thesaurus/antonyms>