coolness vs impassiveness

coolness

noun

  • Indifference; lack of passion or interest. 

  • The state of being cool, i.e. calm. 

  • The state of being cool, i.e. good or pleasing. 

  • The result or product of being cool, i.e. good or pleasing. 

  • The state of being cool, i.e. chilly. 

  • The result or product of being cool, i.e. chilly. 

impassiveness

noun

  • The state of being impassive. 

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