675 entries under adjective topic. ×

10
irrefragable(ideal, all time, the best)
10
plain(clear, flat, firm, honest)
10
real(clear, correct, honest, pure)
10
safe(good, clear, strong, sound)
10
unavoidable(regular, obvious, bound, coming)
9
clear-cut(clear, plain, solid, exact)
9
constant(good, strong, complete, firm)
9
genuine(clear, correct, honest, true)
9
guaranteed(definite, fixed, sure, positive)
9
inarguable(certain, true, ideal, all time)
9
sound(noun, clear, strong, easy)
9
steady(good, strong, complete, easy)
9
trusty(good, strong, honest, solid)
9
unanswerable(ideal, all time, the best)
9
unquestioned(complete, firm, sure, obedient)
8
bound(definite, fixed, unquestionable, guaranteed)
8
definitive(clear, correct, plain, exact)
8
factual(correct, honest, pure, true)
8
flat(change, total, energetic, definite)
8
predetermined(determined, near, usual, regular)
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APASmart Define. (2016). certain thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/certain/thesaurus/synonyms
ChicagoSmart Define. 2016. "certain thesaurus" https://smartdefine.org/certain/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2016, certain thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/certain/thesaurus/synonyms>.
MLASmart Define. "certain thesaurus" 31 March 2016. Web. 22 September 2026. <https://smartdefine.org/certain/thesaurus/synonyms>