7
determinate(adjective, firm, total, superior, unusual)
7
different(adjective, superior, unusual, exceptional, special)
7
emphatic(adjective, flat, firm, definite, distinct)
7
especial(adjective, exact, superior, unusual, exceptional)
7
indefeasible(adjective, ideal, all time, the best)
7
ineluctable(adjective, near, obvious, expected, predictable)
7
irrevocable(adjective, definite, fixed, sure, expected)
7
necessary(adjective, regular, definite, obvious, expected)
7
one(adjective, extraordinary, special, individual, remarkable)
7
patent(adjective, clear, plain, definite, obvious)
7
peremptory(adjective, affirmation, authoritative, overbearing)
7
steadfast(adjective, good, strong, complete, easy)
7
unchallenged(adjective, ideal, all time, the best)
7
unconditional(adjective, complete, total, exact, definite)
7
unconditioned(adjective, ideal, unconditional, all time, the best)
7
uncontestable(adjective, ideal, all time, the best)
7
undoubting(adjective, set, clear, firm, sure)
7
veritable(adjective, correct, material, pure, true)
6
accurate(adjective, set, clear, complete, correct)
6
confirmed(adjective, solid, determined, usual, regular)
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APASmart Define. (2016). certain thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/certain/thesaurus/synonyms
ChicagoSmart Define. 2016. "certain thesaurus" https://smartdefine.org/certain/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2016, certain thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/certain/thesaurus/synonyms>.
MLASmart Define. "certain thesaurus" 31 March 2016. Web. 20 September 2026. <https://smartdefine.org/certain/thesaurus/synonyms>