Infallible vs. Unfailing — What's the Difference?

Incapable of erring

Always able to supply more; inexhaustible

Incapable of failing; certain

Constant; unflagging

Roman Catholic Church Incapable of error in expounding doctrine on faith or morals.

Incapable of error; infallible.

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

Inexhaustible

Without fault or weakness; incapable of error or fallacy.

Changeless, constant

Certain to produce the intended effect, sure.

Infallible

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

Not failing; not liable to fail; inexhaustible; certain; sure.

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

Not liable to failure;

Incapable of error in defining doctrines touching faith or morals. See Papal infallibility, under Infallibility.

Always able to supply more;

Incapable of failure or error;

Unceasing;