- 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 of infallibleMedieval Latin infallibilis: see in- and amp; fallible
- 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 of infallibleMiddle English, from Medieval Latin īnfallibilis : Latin in-, not; see in–1 + Medieval Latin fallibilis, fallible; see fallible.
- in·fal′li·bil′i·ty, in·fal′li·ble·ness
(comparative more infallible, superlative most infallible)