The Hebrew noun zimmah refers to a wicked plan, moral wickedness, or especially sexual lewdness and perversion. It describes premeditated evil — sin that is devised and deliberate rather than accidental.
Zimmah appears frequently in Leviticus and Ezekiel in legal and prophetic contexts describing sexual sin and abomination. It carries the sense of deliberate moral depravity — a calculated departure from God's holy standard. The word is associated with the sexual violations condemned in Leviticus 18-20 and the spiritual adultery of Israel in Ezekiel.
Theologically, zimmah warns that not all sin is equal — planned, deliberate moral perversion is especially serious before God. It also points to the holiness code as God's protection of human dignity and sacred relationships.