74 entries under sound topic. ×

8
valid(adjective, good, right, reasonable)
7
well-founded(adjective, good, reason, proper)
6
just(adjective, good, correct, right)
6
reasonable(adjective, correct, reason, proper)
5
cogent(adjective, good, correct, reasonable)
5
rational(adjective, reasonable, reason, forceful)
4
credible(good, right, reasonable, rational)
4
legal(good, right, reasonable, rational)
4
legitimate(good, correct, right, reasonable)
4
solid(adjective, good, right, reasonable)
4
substantial(good, right, reasonable, rational)
3
good(right, reasonable, rational, genuine)
3
justifiable(reasonable, rational, logical, understandable)
3
strong(good, right, reasonable, rational)
2
authoritative(good, right, reasonable, rational)
2
binding(reasonable, rational)
2
confirmed(good, right, reasonable, rational)
2
lawful(good, right, reasonable, rational)
2
logical(good, right, reasonable, rational)
2
sapient(adjective, reason, knowledgeable, cultured)
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APASmart Define. (2016). well-grounded thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/well-grounded/thesaurus/synonyms
ChicagoSmart Define. 2016. "well-grounded thesaurus" https://smartdefine.org/well-grounded/thesaurus/synonyms (accessed September 29, 2026).
HarvardSmart Define 2016, well-grounded thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/well-grounded/thesaurus/synonyms>.
MLASmart Define. "well-grounded thesaurus" 29 March 2016. Web. 29 September 2026. <https://smartdefine.org/well-grounded/thesaurus/synonyms>