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ruthless

[rooth-lis] /ˈruθ lɪs/
adjective
1.
without pity or compassion; cruel; merciless:
a ruthless tyrant.
Origin of ruthless
1300-1350
1300-50; Middle English; see ruth, -less
Related forms
ruthlessly, adverb
ruthlessness, noun
Synonyms
unrelenting, adamant, relentless. See cruel.
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Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for ruthless

ruthless

/ˈruːθlɪs/
adjective
1.
feeling or showing no mercy; hardhearted
Derived Forms
ruthlessly, adverb
ruthlessness, 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
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Word Origin and History for ruthless
adj.

early 14c., from reuthe "pity, compassion" (see ruth) + -less. Ruthful (early 13c.) has fallen from use since late 17c. except as a deliberate archaism. Related: Ruthlessly; ruthlessness.

Online Etymology Dictionary, © 2010 Douglas Harper
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