68 entries under sound topic. ×

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efficacious(reasonable, rational)
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efficient(reasonable, rational)
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genuine(reasonable, rational)
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in force(expression, reasonable, rational)
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irrefutable(reasonable, rational)
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kosher(reasonable, rational)
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legit(reasonable, rational, justified)
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original(reasonable, rational)
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persuasive(reasonable, rational)
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potent(reasonable, rational)
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powerful(reasonable, rational)
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proven(reasonable, rational)
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pure(reasonable, rational)
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reliable(reasonable, rational)
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secure(adjective, reasonable, rational)
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stringent(reasonable, rational)
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substantial(reasonable, rational)
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telling(reasonable, rational)
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tested(reasonable, rational)
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true(reasonable, rational)
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APASmart Define. (2016). defensible thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/defensible/thesaurus/synonyms
ChicagoSmart Define. 2016. "defensible thesaurus" https://smartdefine.org/defensible/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2016, defensible thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/defensible/thesaurus/synonyms>.
MLASmart Define. "defensible thesaurus" 29 March 2016. Web. 27 September 2026. <https://smartdefine.org/defensible/thesaurus/synonyms>