self-serving vs unkind

self-serving

adj
  • Showing interest only in oneself (pursuing self-interest to the exclusion of other goals). 

unkind

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

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