'Unfaithfully' in the Bible

And it happened [that] in the fifth year of King Rehoboam (for they had acted unfaithfully against Yahweh), Shishak the king of Egypt came up against Jerusalem

But on account of his strength his heart grew proud unto destruction. And he acted unfaithfully against Yahweh his God and went into the temple of Yahweh to offer an incense offering on the altar.

And they stood against King Uzziah and said to him, "It is not for you, Uzziah, to burn incense to Yahweh, but [it is] for the priests, the descendants of Aaron, who are consecrated to burn incense. Go out of the sanctuary, for you have acted unfaithfully. There will be no honor for you from Yahweh God."

For Yahweh subdued Judah for the sake of Ahaz, king of Israel, for he created disorder in Judah and acted unfaithfully against Yahweh.

And in the time of his distress, King Ahaz continued to act unfaithfully against Yahweh.

For our ancestors acted unfaithfully and did evil in the sight of Yahweh our God, and have forsaken him and turned away their faces from the dwelling place of Yahweh. {They have turned their backs} [on it].

Do not be like your fathers and like your brothers, who acted unfaithfully before Yahweh, the God of their ancestors, so that he made them as a desolation, as you see.