cold-blooded vs compassionate

cold-blooded

adj
  • Lacking emotion or compunction. 

  • Of a type of horse: tall and muscular, usually good-natured and suitable for heavy work. 

  • Having an unregulated body temperature; ectothermic. 

compassionate

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

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

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