demonly vs diabolic

demonly

adj

  • Of, relating to, or like a demon; demonic. 

adv

  • In a manner befitting or like a demon. 

diabolic

adj

  • Showing wickedness typical of a devil. 

  • Extremely evil or cruel. 

  • diabolic magic square 

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