unreconcilable vs unyielding

unreconcilable

adj

  • Irreconcilable. 

noun

  • A person or thing that cannot be reconciled. 

unyielding

adj

  • Not giving in; not bending; stubborn. 

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