ruthless

adjective

ruth·​less ˈrüth-ləs How to pronounce ruthless (audio)
 also  ˈru̇th-
: having no pity : merciless, cruel
a ruthless tyrant
ruthlessly adverb
ruthlessness noun

Did you know?

If someone can be ruthless, can one also be ruthful?

Ruthless can be defined as "without ruth" or "having no ruth." So what, then, is ruth? The noun ruth, which is now considerably less common than ruthless, means "compassion for the misery of another," "sorrow for one's own faults," or "remorse." And, just as it is possible for one to be without ruth, it is also possible to be full of ruth. The antonym of ruthless is ruthful, meaning "full of ruth" or "tender." Ruthful can also mean "full of sorrow" or "causing sorrow." Ruth can be traced back to the Middle English noun ruthe, itself from ruen, meaning "to rue" or "to feel regret, remorse, or sorrow."

Examples of ruthless in a Sentence

The journalist was ruthless in his criticism. an office supervisor with a ruthless disregard for others' feelings
Recent Examples on the Web
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With war looming and chaos consuming the kingdom — drawing in the ruthless kings of other Scandinavian countries and even a powerful English ruler — the stage is set for a thundering, cataclysmic, compelling and utterly magical new Norse Saga. Rosy Cordero, Deadline, 6 Oct. 2025 Fantasy worlds like Oz and the Fae Land of Prythian were not exempt from the ruthless gaze of literal-minded Puritan descendants. Brittany Allen, Literary Hub, 6 Oct. 2025 Their methods—ruthless melodic math, brazenly artificial production, and an odd soft spot for reggae rhythms—helped define the world-conquering sound of Britney Spears and Backstreet Boys. Spencer Kornhaber, The Atlantic, 3 Oct. 2025 Only a sadist enjoys facing the ruthless Magic. Fred Katz, New York Times, 2 Oct. 2025 See All Example Sentences for ruthless

Word History

First Known Use

14th century, in the meaning defined above

Time Traveler
The first known use of ruthless was in the 14th century

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Cite this Entry

“Ruthless.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/ruthless. Accessed 8 Oct. 2025.

Kids Definition

ruthless

adjective
ruth·​less ˈrüth-ləs How to pronounce ruthless (audio)
: having no pity : merciless, cruel
ruthlessly adverb
ruthlessness noun

More from Merriam-Webster on ruthless

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