enervation vs frailty

enervation

noun
  • State of being enervated; debility. 

  • Act of enervating; debilitation. 

frailty

noun
  • The condition quality of being frail, physically, mentally, or morally; weakness of resolution; liability to be deceived. 

  • A fault proceeding from weakness; foible; sin of infirmity. 

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