irascible vs sulky

irascible

adj
  • Easily provoked to outbursts of anger; irritable. 

sulky

adj
  • silent and withdrawn after being upset 

noun
  • Any carriage seating only the driver. 

  • A low two-wheeled cart, used in harness racing. 

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