75 entries under adjective topic. ×

4
reliable
3
covered(verb, secure, guarded, sheltered)
3
endorsed(verb, certain, definite, sure)
3
secure(set, firm, solid, certain)
3
set(clear, sound, firm, plain)
3
stipulated(verb, promised)
3
trustworthy
2
agreed(verb, promised)
2
confirmed(verb, set, solid, certain)
2
consented(verb, promised)
2
infallible(clear, certain, flawless, valid)
2
nailed down(expression, clear, simple, plain)
2
on ice(expression, clear, firm, solid)
2
open-and-shut
2
safe(clear, hard, sound, secure)
2
settled(set, solid, certain, fixed)
2
sure-fire(certain, definite, sure, flawless)
2
unfailing(certain, flawless, unquestionable, undisputable)
1
absolutely certain(expression, set, solid, certain)
1
beyond doubt(expression, set, solid, certain)
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APASmart Define. (2015). guaranteed thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/guaranteed/thesaurus/synonyms
ChicagoSmart Define. 2015. "guaranteed thesaurus" https://smartdefine.org/guaranteed/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2015, guaranteed thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/guaranteed/thesaurus/synonyms>.
MLASmart Define. "guaranteed thesaurus" 10 April 2015. Web. 24 September 2026. <https://smartdefine.org/guaranteed/thesaurus/synonyms>