203 entries under solid topic. ×

12
faithful(adjective, good, strong, correct, reasonable)
12
flawless(adjective, good, bad, great, complete)
12
sober(adjective, calm, good, dull, hard)
12
tough(adjective, calm, strong, fit, firm)
12
well-founded(adjective, calm, good, strong, secure)
11
plausible(adjective, clear, reasonable, honest, sensible)
11
rugged(adjective, strong, tough, fit)
11
true(adjective, good, clear, strong, correct)
11
unblemished(adjective, good, bad, great, complete)
11
unimpaired(verb, adjective, good, bad, strong)
10
credible(adjective, reasonable, sensible, rational)
10
heavy(adjective, strong, hard, tough)
9
levelheaded(adjective, calm, good, quiet, hard)
9
staunch(adjective, health, calm, strong, secure)
9
sure(adjective, calm, clear, strong, secure)
8
balanced(adjective, calm, strong, secure, reasonable)
8
loyal(adjective, good, strong, clean, firm)
8
powerful(adjective, clear, strong, direct, tough)
7
able-bodied(adjective, strong, tough, right, fit)
7
certain(adjective, clear, strong, easy, firm)
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APASmart Define. (2016). sound thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/sound/thesaurus/synonyms
ChicagoSmart Define. 2016. "sound thesaurus" https://smartdefine.org/sound/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2016, sound thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/sound/thesaurus/synonyms>.
MLASmart Define. "sound thesaurus" 24 March 2016. Web. 24 September 2026. <https://smartdefine.org/sound/thesaurus/synonyms>