loyalty vs steadfastness

loyalty

noun
  • The state of being loyal; fidelity. 

  • Faithfulness or devotion to some person, cause or nation. 

steadfastness

noun
  • Loyalty in the face of trouble and difficulty. 

  • Steadfast resolution. 

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