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relentless

[ri-lent-lis]
See more synonyms for relentless on Thesaurus.com
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

See more synonyms for relentless on Thesaurus.com
rigid, unbending, obdurate, adamant, unyielding. See inflexible.

Antonyms

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

Examples from the Web for relentlessness

Contemporary Examples

Historical Examples

  • She had softened perhaps from her yesterday's relentlessness.

    The Sea-Hawk

    Raphael Sabatini

  • How could he stand there so like a machine in his relentlessness?

    Brand Blotters

    William MacLeod Raine

  • She felt oppressed by the hardness, the 136 relentlessness, of his words, his manner.

  • Mr. Reade traces their history with all the relentlessness of the genealogist.

    Immortal Memories

    Clement Shorter

  • And this one, though not so powerful, frightened me the more in his relentlessness.

    The Crossing

    Winston Churchill


British Dictionary definitions for relentlessness

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 relentlessness

relentless

adj.

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

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Online Etymology Dictionary, © 2010 Douglas Harper