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 relentless spread of energy-hungry data centers is pushing demand higher still. — Philip H. Gordon, Foreign Affairs, 12 Oct. 2026

The 16-track set is a truly thrilling journey through the relentless ambition and restless psyche of a young Black woman who’s dedicated her life to navigating the notoriously tumultuous music industry. — Kyle Denis, Billboard, 12 Oct. 2026

But as each new model arrives in relentless succession, what happens to those that came before it, or to the videos produced during their training? — Shanti Escalante-De Mattei, ARTnews.com, 12 Oct. 2026

After another stop from the Panther defense, North Crowley’s offense caught a spark with a grueling, relentless tempo. — Charles Baggarly, Fort Worth Star-Telegram, 10 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