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relentless

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

First recorded in 1585–95; relent + -less
Related formsre·lent·less·ly, adverbre·lent·less·ness, noun

Synonyms

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

Antonyms

merciful.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for relentless

relentless

adjective
  1. (of an enemy, hostile attitude, etc) implacable; inflexible; inexorable
  2. (of pace or intensity) sustained; unremitting
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Derived Formsrelentlessly, adverbrelentlessness, 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

Word Origin and History for relentless

adj.

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

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Online Etymology Dictionary, © 2010 Douglas Harper