75 entries under sound topic. ×

10
trustworthy(adjective, good, clear, right)
10
weighty(adjective, clear, right, reasonable)
9
well-founded(adjective, good, right, reasonable)
9
confirmed(adjective, right, reasonable, rational)
8
well-grounded(adjective, good, right, reasonable)
8
compelling(adjective, clear, direct, right)
8
irrefutable(adjective, clear, right, reasonable)
7
binding(adjective, characteristic, right, reasonable)
6
rational(adjective, reasonable, sensible, proper)
6
attested(adjective, right, reasonable, rational)
6
conclusive(adjective, clear, right, reasonable)
6
fair(adjective, good, clear, correct)
6
legit(adjective, good, clear, open, direct)
6
original(adjective, quality, right, reasonable)
5
efficient(adjective, power, right, reasonable)
5
wise(clear, reasonable, sensible, rational)
4
commonsensical(clear, reasonable, sensible, rational)
4
pertinent(adjective, clear, reasonable, sensible)
4
relevant(adjective, clear, reasonable, appropriate)
4
unadulterated(adjective, right, reasonable, pure)
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APASmart Define. (2016). valid thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/valid/thesaurus/synonyms
ChicagoSmart Define. 2016. "valid thesaurus" https://smartdefine.org/valid/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2016, valid thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/valid/thesaurus/synonyms>.
MLASmart Define. "valid thesaurus" 31 March 2016. Web. 21 September 2026. <https://smartdefine.org/valid/thesaurus/synonyms>