without pity or compassion; cruel; merciless: a ruthless tyrant.

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

ruthlessly, adverb
ruthlessness, noun

unrelenting, adamant, relentless. See cruel. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To ruthlessly
World English Dictionary
ruthless (ˈruːθlɪs)
feeling or showing no mercy; hardhearted

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

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
Cite This Source
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.
Copyright © 2014, LLC. All rights reserved.
  • Please Login or Sign Up to use the Recent Searches feature