coldness vs diffidence

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. 

diffidence

noun
  • The state of being diffident, timid or shy; reticence or self-effacement. 

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