Synonyms|300Antonyms|107|Broader|6Narrower|1Related|829
1
solid
1
sound
1
spotless
1
square
1
stainless
1
sterling
1
strict
1
subtle
1
taintless
1
ten(perfect, precise, flawless, faultless, exquisite)
1
tried and true
1
unadulterated
1
unassailable(adjective, certain, flawless)
1
unavoidable(certain, unquestionable, undisputable)
1
unblemished
1
uncontaminated
1
undeniable(clear, certain, valid, unquestionable, undisputable)
1
undeviating
1
undisputable(adjective, certain, unquestionable)
1
undoubted
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APASmart Define. (2015). infallible thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/infallible/thesaurus/synonyms
ChicagoSmart Define. 2015. "infallible thesaurus" https://smartdefine.org/infallible/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2015, infallible thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/infallible/thesaurus/synonyms>.
MLASmart Define. "infallible thesaurus" 10 April 2015. Web. 24 September 2026. <https://smartdefine.org/infallible/thesaurus/synonyms>