Infallible

·adj Not fallible; not capable of erring; entirely exempt from liability to mistake; unerring; inerrable.

II. Infallible ·adj Incapable of error in defining doctrines touching faith or morals. ·see Papal infallibility, under Infallibility.

III. Infallible ·adj Not liable to fail, deceive, or disappoint; indubitable; sure; certain; as, infallible evidence; infallible success; an infallible remedy.