Synonyms|412Antonyms|83|Broader|4Narrower|1Related|376

45 entries under reasonable topic. ×

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conclusive(sound, rational, influential, winning)
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confirmed(good, sound, right, rational)
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credible(good, sound, right, rational)
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defensible(sound, rational)
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determinative(sound, rational)
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genuine(good, sound, right, rational)
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irrefutable(sound, rational)
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justifiable(sound, rational)
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kosher(good, sound, right, rational)
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lawful(good, sound, right, rational)
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legit(good, sound, right, rational)
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legitimate(good, sound, right, rational)
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official(good, sound, right, rational)
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original(good, sound, right, rational)
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proven(sound, rational)
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pure(good, sound, right, rational)
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solid(good, sound, right, rational)
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stringent(good, sound, right, rational)
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tested(good, sound, right, rational)
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ultimate(sound, rational)
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ChicagoSmart Define. 2015. "efficacious thesaurus" https://smartdefine.org/efficacious/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, efficacious thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/efficacious/thesaurus/synonyms>.
MLASmart Define. "efficacious thesaurus" 13 October 2015. Web. 22 September 2026. <https://smartdefine.org/efficacious/thesaurus/synonyms>