64 entries under sound topic. ×

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undoubted(adjective, certain, true, definite)
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weighty(adjective, good, right, reasonable)
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well-founded(adjective, good, right, reasonable)
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well-grounded(adjective, good, right, reasonable)
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APASmart Define. (2015). unanswerable thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/unanswerable/thesaurus/synonyms
ChicagoSmart Define. 2015. "unanswerable thesaurus" https://smartdefine.org/unanswerable/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2015, unanswerable thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/unanswerable/thesaurus/synonyms>.
MLASmart Define. "unanswerable thesaurus" 14 April 2015. Web. 25 September 2026. <https://smartdefine.org/unanswerable/thesaurus/synonyms>