What is the meaning of Impure?

Not pure

Containing undesired intermixtures

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

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

Having side effects.

to defile; to pollute

feminine singular of impur

feminine plural of impuro

basely, shamefully, infamously

impurely

vocative masculine singular of impūrus

Source: wiktionary.org