relentless

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

Origin:
1585–95; relent + -less

relentlessly, adverb
relentlessness, noun


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


merciful.
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World English Dictionary
relentless (rɪˈlɛntlɪs)
 
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
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Etymonline
Word Origin & History

relentless
1590s, from relent + -less.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
It may be slow and relentless-higher temperature, rising oceans, more extreme weather getting progressively worse over a century.
But one way in which technology, as a rule, does make people less happy is in
  its relentless generation of newness.
The trend of the last sixty years has been the fairly relentless improvement of
  the human condition.
He moves from artifact to structure to event, from king to president to imam,
  with a relentless horizontality.
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