enervation vs weakness

enervation

noun
  • State of being enervated; debility. 

  • Act of enervating; debilitation. 

weakness

noun
  • The condition of being weak. 

  • An inadequate quality; fault 

  • A special fondness or desire. 

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