ruthless

adjective

Synonyms of ruthless
: 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
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Our hero and our villain find themselves up against a more ruthless, powerful force than either of them is prepared for. Andy Andersen, Vulture, 17 July 2026 Neill was magnetic as the ruthless CI Major Chester Campbell in Peaky Blinders—an antagonist and romantic rival of Cillian Murphy’s Tommy Shelby. ArsTechnica, 15 July 2026 Ballon d’Or winner Ousmane Dembélé and Michael Olise, who has a tournament-high five assists, were also kept quiet by the ruthless Spaniards. Mark Hodge, NBC news, 15 July 2026 According to Blackstone President and COO Jon Gray, success in finance doesn’t require embracing the ruthless, cutthroat reputation often associated with Wall Street. Preston Fore, Fortune, 15 July 2026 See All Example Sentences for ruthless

Word History

Etymology

Middle English rewthles, routheeles, from rewthe, routhe "pity, ruth" + -les -less

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 22 Jul. 2026.

Kids Definition

ruthless

adjective
: having no pity : merciless, cruel
ruthlessly adverb
ruthlessness noun

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