Etymology
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merciless (adj.)

late 14c., "unfeeling, pitiless, cruel," from mercy + -less. Sense of "relentless" is from early 15c.; of inanimate things, from 1580s. Related: Mercilessly; mercilessness.

updated on December 29, 2018

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Definitions of merciless from WordNet

merciless (adj.)
having or showing no mercy;
gave him a merciless beating
the merciless enemy
a merciless critic
Synonyms: unmerciful
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.