devilish vs diabolic

devilish

adj

  • Characteristic of a devil. 

  • Resembling a devil. 

  • Extreme, excessive. 

adv

  • Devilishly; very; exceedingly. 

diabolic

adj

  • Showing wickedness typical of a devil. 

  • Extremely evil or cruel. 

  • diabolic magic square 

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