The Hebrew adjective bagod describes one who is treacherous or faithless — a person who breaks covenant, betrays trust, or acts deceitfully. It derives from the root bagad (H898), meaning to deal treacherously, cover, or act covertly against another.
Treachery is one of the great covenant violations in Scripture. The prophets repeatedly accuse Israel of being bagod — treacherously unfaithful to God, their covenant husband. Jeremiah calls Judah 'faithless Judah' (Jeremiah 3:7–11), and Isaiah describes how 'the treacherous betray' (Isaiah 33:1). The concept is relational at its core: treachery is only possible where trust existed first. God Himself is never bagod — He is the covenant keeper who remains faithful even when His people are faithless (2 Timothy 2:13). His steadfast love (hesed) is the antidote to human treachery.