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

Much of the tension comes from Shaw’s relentless badgering of Dreyfuss, a dynamic that can grow somewhat repetitive as the play progresses. — Michelle F. Solomon, Miami Herald, 29 July 2026

Quarterly targets, product roadmaps, competitive pressures, and the relentless pace of change demand attention every day. — Shelley Zalis, Forbes.com, 29 July 2026

Moscow is coming under increasing pressure over Kyiv’s relentless drone strikes. — Catherine Belton, Washington Post, 28 July 2026

His comments came after the relentless rally in technology stocks took a breather. — Yun Li, CNBC, 27 July 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