ardency vs coldness

ardency

noun
  • Intensity of heat or burning. 

  • Intensity of devotion. 

  • Intensity of light. 

  • Intensity of feelings. 

coldness

noun
  • The reciprocal of absolute temperature. 

  • Limited enthusiasm or affection; coolness. 

  • The sensation resulting from exposure to low temperatures. 

  • The relative lack of heat. 

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