Definition of "impure"

Not pure

1. Containing undesired intermixtures  examples

2. Unhallowed; defiled by something unholy, either physically by an objectionable substance, or morally by guilt or sin  examples

3. Unchaste; obscene (not according to or not abiding by some system of sexual morality)  quotations  examples

   Quotations

   • “No one would marry her if she was impure, don't you see?” “Impure? Surely if a woman is forcibly deprived of her virginity, she can't be thought of as impure.”

     2012, Frederick Ramsay, The Eighth Veil: A Jerusalem Mystery

(transitive, obsolete) to defile; to pollute