infallible

Meanings

1. 1
   adj

   incapable of failure or error

   an infallible antidote

2. 2
   adj

   Without fault or weakness; incapable of error or fallacy.

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

3. 3
   adj

   Certain to produce the intended effect; sure.

   Try this infallible cure for hiccups.

4. 4
   noun

   A person who, or an object or process that, is taken as being infallible.

Etymology

From Medieval Latin infallibilis, from Latin in- + fallibilis. Compare French infaillible. By surface analysis, in- + fallible.