appetite vs indifference

appetite

noun
  • Desire to eat food or consume drink. 

  • The desire for some personal gratification, either of the body or of the mind. 

  • Any strong desire; an eagerness or longing. 

indifference

noun
  • Unconcerned nonchalance. 

  • The state of being indifferent. 

  • Unbiased impartiality. 

  • Unemotional apathy. 

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

  • A lack of enthusiasm. 

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