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 of relentless

• grim
• determined
• persistent
• unrelenting
• ruthless

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

Neoclouds and other companies leveraged to relentless data center construction also came under pressure. — Eva Roytburg, Fortune, 14 Sep. 2026

Being a relentless forechecker and reliable defender are his paths to sticking in the NHL after an 11-game taste last season, which showed up Sunday when Sýkora helped force the turnover that led to Greentree’s goal. — Vincent Z. Mercogliano, New York Times, 14 Sep. 2026

Globalization, increasingly efficient supply chains and relentless cost reduction helped suppress inflation for decades. — Alex Shahidi, Forbes.com, 14 Sep. 2026

The pace of the industry’s relentless price hikes will have to cool off at some point. — Todd Spangler, Variety, 11 Sep. 2026

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