compassionate vs relentless

compassionate

adj
  • Given to someone as an exception because of a family emergency or a death in their family. 

  • Having, feeling or showing compassion (to or toward someone). 

relentless

adj
  • Unrelenting or unyielding in severity. 

  • Unremitting, steady and persistent. 

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