inanition vs lassitude

inanition

noun
  • A state of advanced lack of adequate nutrition, food, or water or a physiological inability to utilize them, with resulting weakness. 

  • A spiritual emptiness or lack of purpose or will to live, akin to the Existentialist Philosophy state of "nausea". 

  • The act of removing the contents of something; the state of being empty. 

lassitude

noun
  • Lethargy or lack of energy; fatigue. 

  • Listlessness or languor. 

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