'Treacherously' in the Bible

Did not Solomon king of Israel sin [greatly against God] regarding these things? Yet among the many nations there was no king like him. He was loved by his God, and God made him king over all Israel; nevertheless the foreign women caused even him to sin [by turning to other gods and so, judged by God, he lost his kingdom].

Do we then hear about you that you have done all this great evil, acting unfaithfully against our God by marrying foreign (pagan) women?”