merciless

1. a. Destitute of mercy; cruel; unsparing; -- said of animate beings, and also, figuratively, of things; as, a merciless tyrant; merciless waves. Source: opted

2. adj. having or showing no mercy Source: wordnet

3. 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. Syn. -- Cruel; unmerciful; remorseless; ruthless; pitiless; barbarous; savage. -- Mer"ci*less*ly, adv. -- Mer"ci*less*ness, n. Source: webster

4. Destitute of mercy; cruel; unsparing; -- said of animatebeings, and also, figuratively, of things; as, a merciless tyrant;merciless waves.The foe is merciless, and will not pity. Shak. Source: adambom

5. j:100 a. having or showing no mercy Source: ecdict

Thesaurus links