helplessness vs weakness

helplessness

noun
  • The state of being helpless. 

  • A feeling of inadequacy or impotence. 

weakness

noun
  • The condition of being weak. 

  • An inadequate quality; fault 

  • A special fondness or desire. 

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