merciless

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

Origin:
1300–50; Middle English mercyles. See mercy, -less

mercilessly, adverb
mercilessness, noun


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


compassionate.
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World English Dictionary
merciless (ˈmɜːsɪlɪs)
 
adj
without mercy; pitiless, cruel, or heartless
 
'mercilessly
 
adv
 
'mercilessness
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

merciless
c.1300, see mercy + -less. Related: Mercilessly.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Indignant locals can be merciless as the foreigner is objectified, therefore
  allowing any injustice no matter how outrageous.
Dance you will, swept along by the fierce and merciless hand of the machine
  hammer.
As a teacher, he was used to waiting for students who are unfamiliar with the
  merciless rocking and jostling of sailboats.
The other kids were merciless and treated both my friend and me horribly.
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