Infallible
Part of speech: adjective
Definition: Without fault or weakness; incapable of error or fallacy.
Example sentence: God is stronger than their strength, more loving than their uttermost love, and in so far as they have loved and sacrificed themselves for others, they have obtained the infallible proof, that God too lives and loves and gives Himself away.
Inerrant
Part of speech: adjective
Definition: Of or pertaining to inerrancy. Without error, particularly used in reference to the Bible.