impure vs non-moral

impure

adj
  • 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) 

  • Containing undesired intermixtures 

non-moral

adj
  • Not moral; unconnected with morals; having no relation to ethics or morals; not involving ethical or moral considerations. 

How often have the words impure and non-moral occurred in a corpus of books? (source: Google Ngram Viewer )