impure vs louche

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 

louche

adj
  • Of questionable taste or morality; decadent. 

  • Unconventional and slightly disreputable in an attractive manner; raffish, rakish. 

  • Not reputable or decent. 

verb
  • To make (an alcoholic beverage, e.g. absinthe or ouzo) cloudy by mixing it with water, due to the presence of anethole. This is known as the ouzo effect. 

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