disdain vs insouciance

disdain

noun
  • A feeling of contempt or scorn. 

verb
  • To regard (someone or something) with strong contempt. 

insouciance

noun
  • Carelessness, heedlessness, indifference, or casual unconcern. 

  • Nonchalance. 

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