remorseless vs unreconcilable

remorseless

adj

  • Unyielding or relentless. 

  • Without remorse, mercy or pity. 

unreconcilable

adj

  • Irreconcilable. 

noun

  • A person or thing that cannot be reconciled. 

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