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Synonyms
in·fal·li·ble (ĭn-făĺə-bəl)

[Middle English, from Medieval Latin īnfallibilis, Latin in-, not; see in–1, + Medieval Latin fallibilis, fallible; see fallible.]

adjective 

  1. Incapable of erring: an infallible guide; an infallible source of information.
  2. Incapable of failing; certain: an infallible antidote; an infallible rule.
  3. Roman Catholic Church Incapable of error in expounding doctrine on faith or morals.

derivatives

in·faĺli·biĺi·ty
noun
in·faĺli·bly
adverb