re·lent·less

[ri-lent-lis]
adjective
that does not relent; unyieldingly severe, strict, or harsh; unrelenting: a relentless enemy.

Origin:
1585–95; relent + -less

re·lent·less·ly, adverb
re·lent·less·ness, noun


rigid, unbending, obdurate, adamant, unyielding. See inflexible.


merciful.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
relentless (rɪˈlɛntlɪs) [Click for IPA pronunciation guide]
 
adj
1.  (of an enemy, hostile attitude, etc) implacable; inflexible; inexorable
2.  (of pace or intensity) sustained; unremitting
 
re'lentlessly
 
adv
 
re'lentlessness
 
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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00:10
Relentless is always a great word to know.
So is flibbertigibbet. Does it mean:
a chattering or flighty, light-headed person.
a stew of meat, vegetables, potatoes, etc.
Etymonline
Word Origin & History

relentless
1590s, from relent + -less.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Instead, virtue and character are achieved gradually and must be maintained
  through a relentless struggle for self-improvement.
But this time the area of the scalp that was involved became numb, and the pain
  was replaced by a constant, relentless itch.
The trend of the last sixty years has been the fairly relentless improvement of
  the human condition.
He can, on occasion, lock himself up and work with a relentless and giant
  industry.
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