impure vs priapic

impure

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

  • Containing undesired intermixtures 

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

priapic

adj
  • Related to or overly concerned with male sexual activity or exhibiting excessive male sexual activity. 

  • In a state of penile erection. 

  • Phallic. 

  • Excessively masculine; excessively concerned with masculinity. 

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