sluggishness vs torpor

sluggishness

noun
  • The property of being sluggish, unable or unwilling to act quickly. 

  • The state of economic decline, inactivity, slow or subnormal growth. 

torpor

noun
  • A state of being inactive or stuporous. 

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

  • A state of apathy or lethargy. 

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