black-hearted

black-hearted

Thoroughly evil, mean-spirited, or wicked. The black-hearted child was known for his cruel pranks, some of which even caused injuries. Looking into his eyes, I just knew he was black-hearted.
Farlex Dictionary of Idioms.
See also:
  • not cool!
  • if you don't have anything nice to say, don't say anything at all
  • make life difficult
  • make life difficult (for one)
  • make somebody's life a misery
  • misery
  • make (one's) life a misery
  • make life a misery (for one)
  • put/stick the knife in
  • get the knife into someone