insolence vs self-interest

insolence

noun
  • Arrogant conduct; insulting, bold behaviour or attitude. 

  • Insolent conduct or treatment; insult. 

self-interest

noun
  • One's personal interest or advantage, especially when pursued without regard for others. 

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