kittle vs sullen

kittle

adj
  • Not easily managed 

  • Ticklish. 

verb
  • To tickle, to touch lightly. 

  • To bring forth young, as a cat; to kitten; to litter. 

sullen

adj
  • Sluggish; slow. 

  • Having a brooding ill temper; sulky. 

  • Gloomy; dismal; foreboding. 

noun
  • Sullen feelings or manners; sulks; moroseness. 

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