Adulterate \A*dul"ter*ate\, a. 1. Tainted with adultery. [1913 Webster] 2. Debased by the admixture of a foreign substance; adulterated; spurious. [1913 Webster] -- {A*dul"ter*ate*ly}, adv. -- {A*dul"ter*ate*ness}, n. [1913 Webster]