demonly vs stygian

demonly

adj

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

adv

  • In a manner befitting or like a demon. 

stygian

adj

  • Infernal or hellish. 

  • Having a luminosity below 0%. 

  • Dark and gloomy. 

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