infallible


adjective

  1. absolutely trustworthy or sure: an infallible rule.
  2. unfailing in effectiveness or operation; certain: an infallible remedy.
  3. not fallible; exempt from liability to error, as persons, their judgment, or pronouncements: an infallible principle.
  4. Roman Catholic Church. immune from fallacy or liability to error in expounding matters of faith or morals by virtue of the promise made by Christ to the Church.

noun

  1. an infallible person or thing.

adjective

  1. not fallible; not liable to error
  2. not liable to failure; certain; surean infallible cure
  3. completely dependable or trustworthy

noun

  1. a person or thing that is incapable of error or failure
adj.

early 15c., from Medieval Latin infallibilis, from in- “not, opposite of” (see in- (1)) + Late Latin fallibilis (see fallible). In reference to Popes, attested from 1870. Related: Infallibly.

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