'Faithless' in the Bible

The faithless one will pay for his behavior, but a good man will be rewarded for his.

Surely she lies in wait like a bandit, increasing those who are faithless among mankind.

Why do you boast in your valleys? Your valley is flowing away, faithless daughter, who trusted in her treasures, saying, "Who will come against me?'

foolish, faithless, heartless, and ruthless.