Remorse /(r?*m?rs")/

Re·morse

Remorse

n.
  1. The anguish, like gnawing pain, excited by a sense of guilt; compunction of conscience for a crime committed, or for the sins of one's past life.
  2. Sympathetic sorrow; pity; compassion.
    Curse on the unpardoning prince, whom tears can draw To no remorse.
    But evermore it seem'd an easier thing At once without remorse to strike her dead.