infallible

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English[edit]

Etymology[edit]

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

Pronunciation[edit]

Adjective[edit]

infallible (comparative more infallible, superlative most infallible)

  1. Without fault or weakness; incapable of error or fallacy.
    He knows about many things, but even he is not infallible.
  2. certain, sure.
    • 1818, Mary Shelley, chapter 4, Frankenstein[1]:
      I see by your eagerness and the wonder and hope which your eyes express, my friend, that you expect to be informed of the secret with which I am acquainted; that cannot be; listen patiently until the end of my story, and you will easily perceive why I am reserved upon that subject. I will not lead you on, unguarded and ardent as I then was, to your destruction and infallible misery.

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