awful vs perilous

awful

adj
  • Very bad. 

  • Exceedingly great; usually applied intensively. 

adv
  • Very, extremely. 

  • Awfully; dreadfully; terribly. 

perilous

adj
  • Dangerous, full of peril. 

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