ardor vs coldness

ardor

noun
  • Great warmth of feeling; fervor; passion. 

  • Intense heat. 

  • Spirit; enthusiasm; passion. 

coldness

noun
  • Limited enthusiasm or affection; coolness. 

  • The sensation resulting from exposure to low temperatures. 

  • The relative lack of heat. 

  • The reciprocal of absolute temperature. 

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