106 entries under valid topic. ×

6
demonstrable(adjective, clear, true, real)
6
faithful(adjective, good, strong, correct, honest)
5
credible(adjective, correct, pure, original, real)
5
exact(adjective, clear, correct, honest, plain)
5
legitimate(adjective, honest, pure, true, real)
5
provable(adjective, undoubtable, inferable)
5
warranted(adjective, definite, fixed, sure)
4
confirmable(adjective, clear, hard, sound, plain)
4
convincing(adjective, clear, pure, original, definite)
4
known(adjective, clear, understanding, keen, firm)
4
probable(adjective, reasonable, sensible, natural, expected)
4
regular(adjective, correct, reasonable, firm, sensible)
4
supreme(adjective, flawless, faultless, absolute, textbook)
4
typical(adjective, reasonable, sensible, natural)
3
appropriate(adjective, correct, exact, superior, unusual)
3
ascertained(adjective, undoubtable)
3
hard(adjective, clear, correct, certain, true)
2
accepted(adjective, reasonable, sensible, natural, sure)
2
acknowledged(adjective, lawful, rightful, undoubted)
2
admissible(reasonable, sensible, natural, lawful)
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APASmart Define. (2016). certain thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/certain/thesaurus/synonyms
ChicagoSmart Define. 2016. "certain thesaurus" https://smartdefine.org/certain/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2016, certain thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/certain/thesaurus/synonyms>.
MLASmart Define. "certain thesaurus" 31 March 2016. Web. 21 September 2026. <https://smartdefine.org/certain/thesaurus/synonyms>