enervation vs weariness

enervation

noun
  • State of being enervated; debility. 

  • Act of enervating; debilitation. 

weariness

noun
  • Exhaustion, fatigue or tiredness. 

  • A lack of interest or excitement. 

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