imperturbability vs self-control

imperturbability

noun

  • A state of calm, unruffled self-assurance; aplomb, composure. 

self-control

noun

  • The ability to control one's desires and impulses; willpower. 

verb

  • To control oneself or itself. 

How often have the words imperturbability and self-control occurred in a corpus of books? (source: Google Ngram Viewer )