relentless

adjective

re·​lent·​less ri-ˈlent-ləs 

: showing or promising no abatement of severity, intensity, strength, or pace : unrelenting

relentless pressure

a relentless campaign

relentlessly adverb

relentlessness noun

Synonyms

• determined
• dogged
• grim
• implacable
• unappeasable
• unflinching
• unrelenting
• unyielding

Examples of relentless in a Sentence

Her relentless optimism held the team together.

The hunter was relentless in pursuit of his prey.

a relentless opponent of deregulation

Recent Examples on the Web

Google’s index ballooned as its crawlers struggled to process this relentless deluge of pages. —Ivan Guzenko, Forbes.com, 24 Apr. 2025

Still, Starks is a natural leader with a relentless motor who isn't afraid to make contact. —Thomas G. Moukawsher, MSNBC Newsweek, 24 Apr. 2025

Kyle Tucker and Pete Crow-Armstrong launched home runs, part of a relentless lineup that generated 17 hits. —Patrick Mooney, New York Times, 23 Apr. 2025

Through relentless research and serendipity, Casey was able to assemble an extraordinary collection of personal documents preserved by the descendants of his subjects. —Foreign Affairs, 22 Apr. 2025

Word History

First Known Use

1592, in the meaning defined above

Kids Definition

relentless

adjective

re·​lent·​less ri-ˈlent-ləs 

: not lessening in severity, intensity, strength, or pace : unrelenting

relentless criticism

relentlessly adverb

relentlessness noun