frigidity vs unwillingness to open up

frigidity

noun
  • The state of being frigid; coldness; lack of heat. 

  • Coldness of feeling, manner or quality; lack of ardor, animation or vivacity. 

  • Lack of natural heat and vigor of body; impotency. 

unwillingness to open up

How often have the words frigidity and unwillingness to open up occurred in a corpus of books? (source: Google Ngram Viewer )