gnarly vs perilous

gnarly

adj
  • Dangerous; difficult. 

  • Unpleasant, awful, ugly. 

  • Excellent; attractive. 

  • Of music or a sound: harsh. 

  • Having or characterized by gnarls; gnarled. 

perilous

adj
  • Dangerous, full of peril. 

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