Merciless

Part of speech: adjective (a.)

Destitute of mercy; cruel; unsparing; -- said of animate beings, and also, figuratively, of things; as, a merciless tyrant; merciless waves. The foe is merciless, and will not pity. Shak.

Synonyms: Cruel; unmerciful; remorseless; ruthless; pitiless; barbarous; savage. Mer"ci*less*ly, adv. Mer"ci*less*ness, n.