Incredulity; the withholding of belief; as, unbelief is blind.

Infidelity; disbelief of divine revelation.

In the New Testament, disbelief of the truth of the gospel, rejection of Christ as the Savior of men, and of the doctrines he taught; distrust of God’s promises and faithfulnessMatthew 13:58; Mark 16:14, Hebrews 3:12, Romans 4:20.

Weak faith. Mark 9:24.