lethargy vs vivaciousness

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. 

vivaciousness

noun
  • the state of being vivacious; vivacity 

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