indifferent vs listening

indifferent

noun
  • A person who is indifferent or apathetic. 

adj
  • Indicating or reflecting a lack of concern or care. 

  • Ambivalent; unconcerned; uninterested, apathetic. 

  • Having no preference. 

  • Mediocre (usually used negatively in modern usage). 

  • Not making a difference; without significance or importance. 

  • Being in the state of neutral equilibrium. 

listening

noun
  • Skill or ability of perceiving spoken language. 

  • Action of the verb listening 

  • An educational exercise involving listening 

adj
  • Of an action that is performed with caution and attention to sounds. 

  • Of something that is used in order to hear or to improve the ability to hear. 

  • Of something or someone that listens. 

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