'Faithless' in the Bible

"Wicked and faithless generation!" He replied, "they clamour for a sign, but none shall be given to them except the sign of the Prophet Jonah.

A wicked and faithless generation are eager for a sign; but none shall be given to them except the sign of Jonah." and He left them and went away.

Every one, however, who has been ashamed of me and of my teachings in this faithless and sinful age, of him the Son of Man also will be ashamed when He comes in His Father's glory with the holy angels."

faithless to their promises, without natural affection, without human pity.