Synonyms|300Antonyms|107|Broader|6Narrower|1Related|829
2
tried(adjective, flawless)
2
unbeatable(adjective, dependable, unerring)
2
unchangeable(certain, certainty, unquestionable, undisputable)
2
undeceivable(adjective, dependable, unerring)
2
unflawed(perfect, precise, flawless, faultless, exquisite)
2
unmistaken
1
A-okay(perfect, precise, flawless, faultless, exquisite)
1
aces(perfect, precise, flawless, faultless, exquisite)
1
apodictic(adjective, dependable, unerring)
1
apple-pie(perfect, precise, flawless, faultless, exquisite)
1
authoritative(adjective, dependable, unerring)
1
believable
1
beyond all praise(expression, idiom)
1
chaste
1
clear(certain, valid, unquestionable, undisputable, undoubtable)
1
close
1
coincidence
1
conclusive(clear, certain, valid, unquestionable, undisputable)
1
credible
1
defectless
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APASmart Define. (2015). infallible thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/infallible/thesaurus/synonyms
ChicagoSmart Define. 2015. "infallible thesaurus" https://smartdefine.org/infallible/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2015, infallible thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/infallible/thesaurus/synonyms>.
MLASmart Define. "infallible thesaurus" 10 April 2015. Web. 25 September 2026. <https://smartdefine.org/infallible/thesaurus/synonyms>