- The definition of infallible is someone or something that is always perfect and right, without any errors or mistakes.
An example of infallible are the decisions of God.
- incapable of error; never wrong
- not liable to fail, go wrong, make a mistake, etc.; dependable; reliable; sure
- R.C.Ch. incapable of error in setting forth doctrine on faith and morals: said esp. of the pope speaking ex cathedra (i.e., in his official capacity)
Origin: ML infallibilis: see in- and amp; fallible
Used by arrangement with John Wiley & Sons, Inc.
- Incapable of erring: an infallible guide; an infallible source of information.
- Incapable of failing; certain: an infallible antidote; an infallible rule.
- Roman Catholic Church Incapable of error in expounding doctrine on faith or morals.
Origin: Middle English, from Medieval Latin īnfallibilis : Latin in-, not; see in-1 + Medieval Latin fallibilis, fallible; see fallible.
- in·falˌli·bilˈi·ty, in·falˈli·ble·ness noun
- in·falˈli·bly adverb