agitated vs imperturbable

agitated

adj
  • Angry, annoyed, bothered or worked up. 

  • Violently and chaotically moving around, such as because of being shaken. 

imperturbable

adj
  • Not easily perturbed, upset or excited. 

  • Calm and collected, even under pressure. 

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