formality vs frigidity

formality

noun
  • Something said or done as a matter of form. 

  • A specific requirement for obtaining a legal status, conducting a transaction, etc. 

  • A customary ritual without new or unique meaning. 

  • The state of being formal. 

frigidity

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

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

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

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