lifelessness vs sloth

lifelessness

noun
  • The property of being lifeless, the lack of apparent animation. 

sloth

noun
  • Laziness; slowness in the mindset; disinclination to action or labour. 

  • A herbivorous, arboreal South American mammal of the families Megalonychidae and Bradypodidae, noted for its slowness and inactivity. 

  • A collective term for a group of bears. 

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