couldn't care less

/K OW1 L D N T IY0 K EH0 R L EH0 S/
verb
  1. 1

    (idiomatic) To not care at all; to have no interest or concern; to be apathetic.

adjective
  1. 1

    Alternative spelling of couldn't-care-less. [Of or pertaining to indifference; apathetic]