joy vs lassitude

joy

verb
  • To feel joy, to rejoice. 

noun
  • Anything that causes such a feeling. 

  • Luck or success; a positive outcome. 

  • A feeling of extreme happiness or cheerfulness, especially related to the acquisition or expectation of something good. 

lassitude

noun
  • Lethargy or lack of energy; fatigue. 

  • Listlessness or languor. 

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