lethargy vs stupor

lethargy

noun
  • A state of extreme torpor or apathy, especially with lack of emotion, energy or enthusiasm; (loosely) sluggishness, laziness. 

  • A condition characterized by extreme fatigue or drowsiness, deep unresponsiveness, or prolonged sleep patterns. 

stupor

noun
  • A state of extreme apathy or torpor resulting often from stress or shock. 

  • A state of greatly dulled or completely suspended consciousness or sensibility; (particularly medicine) a chiefly mental condition marked by absence of spontaneous movement, greatly diminished responsiveness to stimulation, and usually impaired consciousness. 

verb
  • To place into a stupor; to stupefy. 

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