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Infallible (a.) Not fallible; not capable of erring; entirely exempt from liability to mistake; unerring; inerrable.
Infallible (a.) Not liable to fail, deceive, or disappoint; indubitable; sure; certain; as, infallible evidence; infallible success; an infallible remedy.
Infallible (a.) Incapable of error in defining doctrines touching faith or morals. See Papal infallibility, under Infallibility.