sloth vs slothfulness

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. 

slothfulness

noun
  • The state or quality of being slothful. 

  • The result or product of being slothful. 

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