defenselessness vs frailty

defenselessness

noun
  • The characteristic of being defenseless; vulnerability. 

frailty

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

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

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