The Collaborative International Dictionary of English v.0.48:
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]