harshly vs unkindly

harshly

adv

  • In a harsh manner; severely. 

unkindly

adv

  • In an unkind manner. 

adj

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

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