'Infallible' definitions:

Definition of 'infallible'

From: WordNet
adjective
Incapable of failure or error; "an infallible antidote"; "an infallible memory"; "the Catholic Church considers the Pope infallible"; "no doctor is infallible" [ant: fallible]

Definition of 'Infallible'

From: GCIDE
  • Infallible \In*fal"li*ble\, a. [Pref. in- not + fallible: cf. F. infallible.] [1913 Webster]
  • 1. Not fallible; not capable of erring; entirely exempt from liability to mistake; unerring; inerrable. --Dryden. [1913 Webster]
  • 2. Not liable to fail, deceive, or disappoint; indubitable; sure; certain; as, infallible evidence; infallible success; an infallible remedy. [1913 Webster]
  • To whom also he showed himself alive, after his passion, by many infallible proofs. --Acts i. 3. [1913 Webster]
  • 3. (R. C. Ch.) Incapable of error in defining doctrines touching faith or morals. See Papal infallibility, under Infallibility. [1913 Webster]