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Definitions

relentless

[ri-lent-lis] / rɪˈlɛnt lɪs /
ADJECTIVE
cruel, merciless
Synonyms
STRONGEST
determined dogged ferocious fierce harsh implacable inexorable rigorous ruthless single-minded uncompromising unforgiving unrelenting unstoppable unyielding
WEAK
adamant bound bound and determined dead set on go for broke grim hang in hang-tough hard inflexible inhuman mortal obdurate pitiless remorseless rigid stiff stop-at-nothing strict stringent unappeasable unbending undeviating unflinching vindictive
Antonyms
STRONGEST
compassionate easy flexible gentle irresolute kind lenient merciful mild nice nonviolent peaceful remorseful sympathetic tame tender yielding
WEAK
ending intermittent stopping understanding
ADJECTIVE
continuous, neverending
Synonyms
STRONGEST
incessant nonstop persistent punishing sustained tenacious unflagging unrelenting unremitting unstoppable
WEAK
pertinacious unabated unbroken unfaltering unrelieved
Antonyms
STRONGEST
intermittent relenting surrendering yielding
WEAK
ending kind merciful stopping sympathetic understanding

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Relentless rain has lashed south-central Vietnam since late October and popular holiday destinations have been hit by several rounds of flooding.

From Barron's • Nov. 22, 2025

Relentless discipline, the kind that makes Trappist monks look impulsive.

From MarketWatch • Oct. 9, 2025

Relentless market uncertainty and narrowing opportunities to take startups public are leading venture capitalists to take a step back from biotechnology.

From The Wall Street Journal • Jul. 31, 2025

One of the places down the street from us is called Relentless, they’re great.

From Los Angeles Times • Dec. 20, 2024

Relentless, Alan lunges toward him, again and again.

From "Black Brother, Black Brother" by Jewell Parker Rhodes

Vocabulary lists containing relentless

The Giver

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A Long Walk to Water

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Power Suffix: -less

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