eh vs who cares

eh

intj
  • An interjection used to ascertain the continued attention of an individual addressed by the speaker. 

  • Expressing apprehension following or preceding a reasoning or excuse; uh. 

  • Used as a tag question, to emphasise what goes before or to request that the listener express an opinion about what has been said. 

  • In isolation, a request for repetition or clarification of what has just been said; compare what, pardon. 

  • In isolation, expressing surprise or confusion; compare wha, huh, za. 

  • Expressing apathy or lack of enthusiasm; meh. 

adj
  • Of mediocre quality; unremarkable. 

verb
  • To use the interjection eh. 

who cares

phrase
  • A reply that diminishes the importance of another speaker's immediately preceding statement. 

  • A reply to an unimportant or irrelevant statement, indicating indifference on the part of the speaker. 

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