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relentless

[ri-lent-lis] /rɪˈlɛnt lɪs/
adjective
1.
that does not relent; unyieldingly severe, strict, or harsh; unrelenting:
a relentless enemy.
Origin
1585-1595
1585-95; relent + -less
Related forms
relentlessly, adverb
relentlessness, noun
Synonyms
rigid, unbending, obdurate, adamant, unyielding. See inflexible.
Antonyms
merciful.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for relentless
  • 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.
  • Then the relentless guns of the hunters may have finished the species off.
  • Combating that relentless spread can be both difficult and prohibitively expensive.
  • Steroid use is fraught with side effects, however, so the hunt for alternatives has been relentless.
  • It has a certain relentless monotony that would render any such narrative boring.
  • No shoreline will be able to escape the relentless tidal waves.
  • The relentless engine of natural selection should have eliminated any genes that infringed on them.
British Dictionary definitions for relentless

relentless

/rɪˈlɛntlɪs/
adjective
1.
(of an enemy, hostile attitude, etc) implacable; inflexible; inexorable
2.
(of pace or intensity) sustained; unremitting
Derived Forms
relentlessly, adverb
relentlessness, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for relentless
adj.

1590s, from relent + -less. Related: Relentlessly; relentlessness.

Online Etymology Dictionary, © 2010 Douglas Harper
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