fervent vs mad-dog

fervent

adj
  • Having or showing emotional warmth, fervor, or passion. 

  • Glowing, burning, very hot. 

  • Exhibiting particular enthusiasm, zeal, conviction, persistence, or belief. 

mad-dog

adj
  • Fanatically or irrationally ferocious. 

How often have the words fervent and mad-dog occurred in a corpus of books? (source: Google Ngram Viewer )