To corrupt, debase, or make impure by an admixture of a foreign or a baser substance; as, to adulterate food, drink, drugs, coin, etc.

Debased by the admixture of a foreign substance; adulterated; spurious.

corrupt, debase, or make impure by adding a foreign or inferior substance; often by replacing valuable ingredients with inferior ones; "adulterate liquor"

Tainted with adultery.

To defile by adultery.

To commit adultery.