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

While its megacap rivals are currently engaged in a relentless, capital-intensive arms race to outspend one another on infrastructure, Apple's relatively low capex stands out as a testament to its disciplined capital allocation. — Michael Khouw, CNBC, 2 Nov. 2026

The Storm was relentless in the second half with 10 shots on goal. — Paul Johnson, Chicago Tribune, 31 Oct. 2026

Beyond Bars is intense and relentless in its twists and turns. — Jesse Whittock, Deadline, 29 Oct. 2026

For starters, the Valkyries defense is relentless and physical. — Tyler Estep, AJC.com, 28 Oct. 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