selfishness vs thoughtlessness

selfishness

noun
  • the quality of being selfish; the condition of putting one's own interests before those of others. 

thoughtlessness

noun
  • disregard for other's feelings 

  • heedless disregard for the consequences of one's actions 

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