obedient vs unyielding

obedient

noun
  • One who obeys. 

adj
  • Willing to comply with the commands, orders, or instructions of those in authority. 

unyielding

adj
  • Not giving in; not bending; stubborn. 

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