1.AdjectiveIntentionally tainted with impurities (usually as motivated by cheapening the production of a food product or enhancing the psychotropic effects of a street drug).
"The problem of adulterated milk has periodically reemerged as a public health menace, from New York in the 1850s to China in 2008.; Heroin is often adulterated with fentanyl."
2.Verbsimple past and past participle of adulterate