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

This dedication serves as the driving force behind every donation, propelling us forward in our relentless pursuit of progress in cancer research. —Sean Krofssik, Hartford Courant, 8 Apr. 2025

The Trump administration has been relentless about scrubbing government websites of all mentions of climate change, no matter how anodyne, but this was gentle stuff. —Ross Andersen, The Atlantic, 6 Apr. 2025

After Cooper Flagg knocked down a pair of free throws at the 11:54 mark to give the Blue Devils a 56-42 lead, Houston stormed back with a relentless 28-11 run to complete a stunning rally and punch their ticket to the title game. —John W. Dean, MSNBC Newsweek, 6 Apr. 2025

With an ambitious 22-track lineup inspired by Yakuza mystique and Samurai discipline, according to the press release, the LP packs raw lyricism, relentless ambition, and next-level collaborations. —Griselda Flores, Billboard, 4 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