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

The size of these companies has been a seismic change, as has the market’s relentless concentration around tech. — Allie Garfinkle, Fortune, 28 Sep. 2026

Russia kept up its relentless round-the-clock attacks on the Ukrainian capital, hitting an office block where four people were killed, Zelenskyy said. — Hanna Arhirova, Arkansas Online, 26 Sep. 2026

Russia kept up its relentless round-the-clock attacks on the Ukrainian capital, hitting an office block where four people were killed, Zelensky said. — Hanna Arhirova, Los Angeles Times, 25 Sep. 2026

Harari pursues the question with relentless urgency rooted in the ordinary problems, psychological and practical, that David faces—including the difficulty of finding his original body. — Richard Brody, New Yorker, 25 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