submissive vs unyielding

submissive

adj

  • Meekly obedient or passive. 

noun

  • One who submits. 

  • One who submits to a dominant partner in BDSM practices. 

unyielding

adj

  • Not giving in; not bending; stubborn. 

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