pleasure vs unhappiness

pleasure

verb
  • To give or afford pleasure to. 

  • To give sexual pleasure to. 

intj
  • pleased to meet you, "It's my pleasure" 

noun
  • A person, thing or action that causes enjoyment. 

  • One's preference. 

  • A state of being pleased or contented; gratification. 

  • The will or desire of someone or some agency in power. 

unhappiness

noun
  • The feeling of not being happy 

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