hardihood vs steadfastness

hardihood

noun
  • Unyielding boldness and daring; firmness in doing something that exposes one to difficulty, danger, or calamity; intrepidness. 

  • Ability to withstand extreme conditions, hardiness. 

  • Excessive boldness; foolish daring; offensive assurance. 

steadfastness

noun
  • Loyalty in the face of trouble and difficulty. 

  • Steadfast resolution. 

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