'Untrue' in the Bible

The upright town has become untrue; there was a time when her judges gave right decisions, when righteousness had a resting-place in her, but now she is full of those who take men's lives.

Because you have said, We have made death our friend, and with the underworld we have made an agreement; when the overflowing waters come through they will not come near us; for we are looking to false words for help, taking cover in what is untrue: