helplessness vs mettle

helplessness

noun
  • A feeling of inadequacy or impotence. 

  • The state of being helpless. 

mettle

noun
  • Good temperament and character. 

  • A quality of endurance and courage. 

adj
  • Spirited, vigorous, stout-hearted. 

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