ruthless

[rooth-lis]
adjective
without pity or compassion; cruel; merciless: a ruthless tyrant.

Origin:
1300–50; Middle English; see ruth, -less

ruthlessly, adverb
ruthlessness, noun


unrelenting, adamant, relentless. See cruel.
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World English Dictionary
ruthless (ˈruːθlɪs)
 
adj
feeling or showing no mercy; hardhearted
 
'ruthlessly
 
adv
 
'ruthlessness
 
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

ruthless
early 14c., from reuthe "pity, compassion" (late 12c.), formed from reuwen "to rue" (see rue (v.)) on the model of true/truth, etc. Ruthful (early 13c.) has fallen from use since late 17c. except as a deliberate archaism.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
We are supposed to neither cling ruthlessly to the old, nor jump carelessly to
  the new.
Prodigious as were his royalties, his mode of life consumed them ruthlessly.
More and more, they were pure meritocrats trained to look ruthlessly for
  efficiency everywhere.
The peak moment was when you read from your book to prove the atrocious
  misquotation that's been ruthlessly used against you.
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