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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 for relentless

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Antonyms for relentless Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for relentless


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

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

Online Etymology Dictionary, © 2010 Douglas Harper