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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 of relentless
1585-1595
First recorded in 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. 2017.
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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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