sloth vs torpor

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. 

torpor

noun
  • A state of apathy or lethargy. 

  • A state similar to hibernation characterised by energy-conserving, very deep sleep. 

  • A state of being inactive or stuporous. 

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