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merciless

[mur-si-lis]
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adjective
  1. without mercy; having or showing no mercy; pitiless; cruel: a merciless critic.
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Origin of merciless

First recorded in 1300–50, merciless is from the Middle English word mercyles. See mercy, -less
Related formsmer·ci·less·ly, adverbmer·ci·less·ness, noun

Synonyms

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hard, relentless, unrelenting, fell, unsympathetic, inexorable.

Antonyms

compassionate.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for mercilessly

merciless

adjective
  1. without mercy; pitiless, cruel, or heartless
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Derived Formsmercilessly, adverbmercilessness, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for mercilessly

merciless

adj.

late 14c., see mercy + -less. Related: Mercilessly.

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Online Etymology Dictionary, © 2010 Douglas Harper