compassionless vs unkindly

compassionless

adj

  • Without compassion; hardhearted. 

unkindly

adj

  • Not kind, lacking in friendliness, warm-heartedness or sympathy. 

adv

  • In an unkind manner. 

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