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

Their directing is relentless, inventive, and unforgettable. —Ben Travers, IndieWire, 12 May 2026

Amazon’s approach A relentless focus on speed helped Amazon build a logistics and e-commerce empire. —Anne D’innocenzio, Los Angeles Times, 12 May 2026

Roberts, the relentless optimist, understands this. —Fabian Ardaya, New York Times, 12 May 2026

Over the course of 10-plus years, the European jazz quartet has forged a collective sound driven by repetition, precision, angularity, and relentless, sweaty energy. —Levi Dayan, Pitchfork, 11 May 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