Synonyms|300Antonyms|107|Broader|6Narrower|1Related|829

76 entries under adjective topic. ×

5
positive(clear, certain, valid, dependable)
5
trusty
4
acceptable(dependable, unerring)
4
agreeable(dependable, unerring)
4
efficient(dependable, unerring)
4
honest
4
necessary(certain, inevitable)
4
safe(clear, flawless, valid, undoubtable)
4
satisfactory(dependable, unerring)
4
satisfying(dependable, unerring)
4
sure-fire(informal, certain, flawless, dependable)
3
efficacious(dependable, unerring)
3
handy(dependable, unerring)
3
helpful(dependable, unerring)
3
incontrovertible(clear, certain, valid, dependable)
3
surefire(certain, reliable, trustworthy, dependable)
3
true(dependable, unerring)
3
unquestionable(certain, dependable, undisputable, unerring)
3
useful(dependable, unerring)
2
definite(clear, certain, valid, unquestionable)
For more, visit Infallible on Power Thesaurus
11 years ago|10k views|share |citing 
APASmart Define. (2015). infallible thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/infallible/thesaurus/synonyms
ChicagoSmart Define. 2015. "infallible thesaurus" https://smartdefine.org/infallible/thesaurus/synonyms (accessed September 26, 2026).
HarvardSmart Define 2015, infallible thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/infallible/thesaurus/synonyms>.
MLASmart Define. "infallible thesaurus" 10 April 2015. Web. 26 September 2026. <https://smartdefine.org/infallible/thesaurus/synonyms>