lethargy vs vehemence

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. 

vehemence

noun
  • Eagerness, fervor, excessive strong feeling. 

  • A wild or turbulent ferocity or fury. 

  • An intense concentration, force or power. 

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