merciless

[mur-si-lis] / ˈmɜr sɪ lɪs /

ADJECTIVE

mean, heartless

Synonyms

STRONGEST

barbarous callous cruel fierce grim harsh implacable inexorable inhumane relentless ruthless severe unforgiving unrelenting unsparing unyielding

STRONG

unmerciful

WEAK

compassionless cutthroat dog-eat-dog gratuitous hard hardhearted hatchet job having a killer instinct iron-fisted mean machine mortal pitiless unappeasable uncalled-for unfeeling unflinching unpitying unsympathetic wanton

Antonyms

STRONGEST

bright calm compassionate considerate easy feeling flexible gentle kind merciful mild nice peaceful polite remorseful sympathetic tender yielding

WEAK

giving sparing

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.

Zverev was also undone in last year's Australian Open final by Sinner, who produced a merciless performance which led to the German saying he felt mentally "empty" a few months later.

From BBC • Jun. 5, 2026

For patients who have faced one of medicine’s most merciless diagnoses, it is a genuine breakthrough.

From The Wall Street Journal • Apr. 28, 2026

The 1972 peak was followed by a merciless recession in the mid-1970s, and a heartbreaking stock market bust.

From Barron's • Dec. 31, 2025

Nevertheless, she remains as statuesque and merciless as Weaver was onscreen.

From Los Angeles Times • Oct. 28, 2025

How would we be able to tell that they were all victims of a merciless war?

From "Sapiens: A Brief History of Humankind" by Yuval Noah Harari

Vocabulary lists containing merciless

Hamilton

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Schooled

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Theodore Roosevelt on "The Man with the Muck Rake" (1906)

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