disregard vs indifference

disregard

noun
  • The act or state of deliberately not paying attention or caring about; misregard. 

verb
  • To ignore; pay no attention to. 

indifference

noun
  • The state of being indifferent. 

  • Unconcerned nonchalance. 

  • Unbiased impartiality. 

  • Unemotional apathy. 

  • Self-identity defined through the negation of difference, non-difference. 

  • A lack of enthusiasm. 

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