hurtful vs unkind

hurtful

adj
  • Tending to hurt someone's feelings; insulting. 

  • Tending to impair or damage; injurious; occasioning loss or injury. 

unkind

adj
  • Lacking kindness, sympathy, benevolence, gratitude, or similar; cruel, harsh or unjust; ungrateful. 

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