constancy vs helplessness

constancy

noun
  • The quality of being constant; steadiness or faithfulness in action, affections, purpose, etc. 

  • An unchanging quality or characteristic of a person or thing. 

helplessness

noun
  • A feeling of inadequacy or impotence. 

  • The state of being helpless. 

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