lethargy vs might

lethargy

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

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

might

verb
  • simple past tense of may Used to indicate permission in past tense. 

  • Used to indicate conditional or possible actions. 

  • Even though. 

  • Used in polite requests for permission 

  • Used to indicate a desired past action that was not done. 

  • simple past tense of may Used to indicate possibility in past tense. 

  • Used to express certainty. 

noun
  • The ability to do something. 

  • Power, strength, force or influence held by a person or group. 

  • Physical strength or force. 

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