Měr'ci-less, a.
a. 1. Destitute of mercy; unfeeling; pitiless; hard-hearted; as, a merciless tyrant.
The foe is merciless, and will not pity. Shak.
Sense 2. Acting without mercy; unsparing; relentless; cruel; severe; as, the merciless waves or tempest.
Synonyms—Cruel; unfeeling; unmerciful; remorseless; ruthless; pitiless; hard-hearted; severe; barbarous; savage.