Synonyms of relentless

relentless

adjective

ri-ˈlent-ləs 

as in grim

showing no signs of slackening or yielding in one's purpose

the team's offense was relentless in trying to score a touchdown

Synonyms & Similar Words

• grim
• determined
• persistent
• unrelenting
• ruthless
• implacable
• dogged
• unflinching
• unyielding
• stubborn
• unappeasable
• willful
• merciless
• hard
• tenacious
• obdurate
• uncooperative
• opinionated
• intractable
• peevish
• persevering
• headstrong
• pertinacious
• mulish
• unforgiving
• perverse
• hardheaded
• pigheaded
• self-willed

Antonyms & Near Antonyms

• softening
• yielding
• weak
• impotent
• slack
• spineless
• slackening
• invertebrate
• complaisant
• pliable
• pliant
• obliging

Example Sentences

Recent Examples of relentless

In Trengove’s relentless third feature, a sheltered 11-year-old white South African boy gradually comes to realise the horrors of the apartheid system. — Zac Ntim, Deadline, 21 July 2026

Meanwhile, hundreds of millions of people in the US and Europe have sweltered beneath relentless heat domes that have resulted in thousands of excess deaths in Europe alone. — Andrew Freedman, CNN Money, 20 July 2026

Blazing pavement and relentless humidity can cause your car’s air conditioning system to work overtime just to keep the cabin comfortable. — Jessica Safavimehr, Southern Living, 20 July 2026

At the same time, Jupiter’s opposition to Pluto retrograde reminds us that ambition without self-awareness can inevitably cloud our judgment, tempting us to overextend ourselves in the relentless pursuit of success. — Valerie Mesa, PEOPLE, 20 July 2026