remorseless, ruthless, slash-and-burn, soulless, stony.

What kind of word is merciless?

merciless Add to list Share. Use the adjective merciless to describe someone who acts in a cruel, heartless way. You could accuse your rabbit-hunting brother of being merciless. Merciless is the antonym, or opposite, of "merciful." If a person shows no mercy or pity, she is merciless.

What is the root word of merciless?

merciless (adj.)

late 14c., "unfeeling, pitiless, cruel," from mercy + -less.