Fescennine vs indecorous

Fescennine

adj
  • Of or pertaining to the ancient Etruscan town of Fescennia 

  • obscene or scurrilous 

indecorous

adj
  • improper, immodest or indecent 

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