Dictionary
in•fal•li•ble
Pronunciation: (in-fal'u-bul), [key]—
adj.
1. absolutely trustworthy or sure:
an infallible rule.
2. unfailing in effectiveness or operation; certain:
an infallible remedy.
3. not fallible; exempt from liability to error, as persons, their judgment, or pronouncements:
an infallible principle.
4. Rom. Cath. Ch.immune from fallacy or liability to error in expounding matters of faith or morals by virtue of the promise made by Christ to the Church.
—
n.
an infallible person or thing.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.