Infallible Definition

Incapable of erring.
An infallible guide; an infallible source of information.
American Heritage
Incapable of error; never wrong.
Webster's New World
Not liable to fail, go wrong, make a mistake, etc.; dependable; reliable; sure.
Webster's New World
Incapable of error in setting forth doctrine on faith and morals.
Webster's New World

Without fault or weakness; incapable of error or fallacy.

He knows about many things, but even he is not infallible.
An infallible person or thing.
Webster's New World

Origin of Infallible

  • Middle English from Medieval Latin īnfallibilis Latin in- not in–1 Medieval Latin fallibilis fallible fallible

    From American Heritage Dictionary of the English Language, 5th Edition

  • From Medieval Latin infallibilis, from Latin in- + fallibilis. Compare French infaillible.

    From Wiktionary

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