malcontent vs sullen

malcontent

adj
  • Dissatisfied with current conditions; disaffected, discontented, rebellious. 

noun
  • A person who is not satisfied with current conditions; a discontented person, a rebel. 

sullen

adj
  • Having a brooding ill temper; sulky. 

  • Gloomy; dismal; foreboding. 

  • Sluggish; slow. 

noun
  • Sullen feelings or manners; sulks; moroseness. 

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