162 entries under solid topic. ×

6
definite(adjective, clear, strong, sound, easy)
6
determined(adjective, clear, strong, easy, firm)
6
durable(adjective, calm, strong, secure, tough)
6
fast(adjective, calm, close, strong, secure)
6
strong(adjective, calm, sound, tough, reasonable)
6
tried and true(expression, adjective, idiom, close, strong)
6
well-founded(adjective, calm, good, strong, secure)
5
resolute(adjective, calm, close, strong, secure)
5
tough(adjective, calm, strong, secure, firm)
5
tried-and-true(adjective, good, sensible, fair)
5
trustable(open, honest, sensible, accurate)
4
unswerving(adjective, close, correct, firm, honest)
4
absolute(adjective, clear, strong, easy, firm)
4
assured(adjective, strong, easy, firm)
4
balanced(adjective, calm, strong, secure, easy)
4
cogent(adjective, good, reasonable, sensible)
4
conclusive(adjective, clear, strong, reasonable, easy)
4
exact(adjective, good, close, open, correct)
4
plausible(open, sound, reasonable, honest, sensible)
4
precise(adjective, good, close, open, correct)
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APASmart Define. (2016). reliable thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/reliable/thesaurus/synonyms
ChicagoSmart Define. 2016. "reliable thesaurus" https://smartdefine.org/reliable/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2016, reliable thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/reliable/thesaurus/synonyms>.
MLASmart Define. "reliable thesaurus" 3 March 2016. Web. 22 September 2026. <https://smartdefine.org/reliable/thesaurus/synonyms>