English → Latin
“infallible” in Latin
certuscertain; fixed, settled, firm; resolved, determinedexplōrōto investigate, search out, seek, discover, examine, explore; to spy out, reconnoitre; to test, try, put to the proof
The English word infallible itself goes back to Latin fallō, through īnfallibilis.
Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864
infallible
(a) (a) That does not deceive, certus: non dubius (certain, not doubtful): exploratus (made or found out). (b) Incapable of being deceived, *errori non obnoxius. To be infallible, omni errore carere.
Quick answer
- What is the Latin word for infallible?
- The usual Latin words for “infallible” are certus, explōrō. The right choice depends on the sense; see the distinctions below.
Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.