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1
well-founded
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APASmart Define. (2016). unsubstantial thesaurus. Retrieved September 30, 2026, from https://smartdefine.org/unsubstantial/thesaurus/antonyms
ChicagoSmart Define. 2016. "unsubstantial thesaurus" https://smartdefine.org/unsubstantial/thesaurus/antonyms (accessed September 30, 2026).
HarvardSmart Define 2016, unsubstantial thesaurus, Smart Define, viewed 30 September, 2026, <https://smartdefine.org/unsubstantial/thesaurus/antonyms>.
MLASmart Define. "unsubstantial thesaurus" 30 March 2016. Web. 30 September 2026. <https://smartdefine.org/unsubstantial/thesaurus/antonyms>