atrocious vs horrendous

atrocious

adj
  • Very bad; abominable, disgusting. 

  • Frightful, evil, cruel, or monstrous. 

  • Offensive or heinous. 

horrendous

adj
  • Extremely bad; awful; terrible. 

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