barbarous vs mad-dog

barbarous

adj
  • Mercilessly or impudently violent or cruel, savage. 

  • Not classical or pure. 

  • Uncivilized, uncultured. 

  • Like a barbarian, especially in sound; noisy, dissonant. 

mad-dog

adj
  • Fanatically or irrationally ferocious. 

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