hebetate vs sullen

hebetate

adj
  • obtuse; dull 

  • Having a dull or blunt and soft point 

verb
  • To render obtuse; to dull; to blunt. 

sullen

adj
  • Gloomy; dismal; foreboding. 

  • Having a brooding ill temper; sulky. 

  • Sluggish; slow. 

noun
  • Sullen feelings or manners; sulks; moroseness. 

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