93 entries under sound topic. ×

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defensible(reasonable, rational)
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determinative(reasonable, rational)
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efficient(good, right, reasonable, rational)
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in force(expression, good, right, reasonable)
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justifiable(reasonable, rational)
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pure(good, right, reasonable, rational)
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rational(adjective, reasonable, legitimate, well-founded)
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stringent(good, right, reasonable, rational)
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tested(good, right, reasonable, rational)
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ultimate(reasonable, rational)
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unadulterated(good, right, reasonable, rational)
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unanswerable(good, right, reasonable, rational)
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uncorrupted(good, right, reasonable, rational)
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APASmart Define. (2016). substantial thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/substantial/thesaurus/synonyms
ChicagoSmart Define. 2016. "substantial thesaurus" https://smartdefine.org/substantial/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2016, substantial thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/substantial/thesaurus/synonyms>.
MLASmart Define. "substantial thesaurus" 24 March 2016. Web. 27 September 2026. <https://smartdefine.org/substantial/thesaurus/synonyms>