84 entries under reasonable topic. ×

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original(sound, rational)
0
persuasive(sound, rational)
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potent(sound, rational)
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powerful(sound, rational)
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probable
0
proven(sound, rational)
0
pure(sound, rational)
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reliable(sound, rational)
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secure(adjective, sound, rational)
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sound(rational, justified)
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stringent(sound, rational)
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substantial(sound, rational)
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suitable
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telling(sound, rational)
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tested(sound, rational)
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true(sound, rational)
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trustworthy(sound, rational)
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ultimate(sound, rational)
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unadulterated(sound, rational)
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unanswerable(sound, rational)
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APASmart Define. (2016). defensible thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/defensible/thesaurus/synonyms
ChicagoSmart Define. 2016. "defensible thesaurus" https://smartdefine.org/defensible/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2016, defensible thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/defensible/thesaurus/synonyms>.
MLASmart Define. "defensible thesaurus" 29 March 2016. Web. 23 September 2026. <https://smartdefine.org/defensible/thesaurus/synonyms>