infallible

/ɪnˈfa.lɪ.b(ə)l//ɪnˈfæ.lə.bəl/

adjective

  1. 1

    Without fault or weakness; incapable of error or fallacy.

    He knows about many things, but even he is not infallible.
  2. 2

    Certain to produce the intended effect, sure.

    Try this infallible cure for hiccups.

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