infallible

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

• (UK) IPA^(key): /ɪnˈfa.lɪ.b(ə)l/
• (US) IPA^(key): /ɪnˈfæ.lə.bəl/

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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 to produce the intended effect, sure.

   Try this infallible cure for hiccups.

1. • 1818, Mary Shelley, chapter 4, in Frankenstein‎:

     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.

• faultless
• perfect
• indefective

• fallible
• defective
• faultful
• faulty
• imperfect
• error-prone

• infallibility
• infallibly