impure

Short definition from Wiktionary

Adjective

1. 1
   Not pure: Containing undesired intermixtures
2. 2
   Not pure: Unhallowed; defiled by something unholy, either physically by an objectionable substance, or morally by guilt or sin
3. 3
   Not pure: Unchaste; obscene (not according to or not abiding by some system of sexual morality)

Verb

1. 1
   to defile; to pollute