contentment vs unhappiness

contentment

noun
  • happiness in one's situation; satisfaction 

  • The neurophysiological experience of satisfaction and being at ease in one's situation, body, and/or mind. 

  • The state or degree of being contented or satisfied. 

unhappiness

noun
  • The feeling of not being happy 

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