indomitable vs unreconcilable

indomitable

adj

  • Incapable of being subdued, overcome, or vanquished. 

unreconcilable

adj

  • Irreconcilable. 

noun

  • A person or thing that cannot be reconciled. 

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