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