gripping vs unreadable

gripping

adj
  • Which catches someone's attention; exciting 

noun
  • The act of forming a grip. 

unreadable

adj
  • Not able to be read—i.e. accessed or played—by some technical device. 

  • Not sufficiently interesting to be worth reading. 

  • That cannot be read or is not easy to read. 

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