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
Indeed, statement after statement in the book lays out the conditions of
  non-learning relentlessly.
The only way that companies can prosper in these markets is to cut costs
  relentlessly and accept profit margins close to zero.
Relentlessly pushing body and mind, athletes probe the limits of human
  performance.
People with disfigurements would probably rather not have strangers staring
  relentlessly at them.
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