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
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.
The 22nd Amendment was written precisely to prevent this scenario—to ensure that no man, however popular or ruthless, could hold the republic hostage and affect billions with temper tantrums ad infinitum. Dan Perry, MSNBC Newsweek, 31 Oct. 2025 From filmmaker Jo Southwell (Call the Midwife), The Catch follows a ruthless culinary showdown as a brilliant but obsessive chef journeys to Cornwall in search of the rarest seafood of all — a mermaid. Matt Grobar, Deadline, 30 Oct. 2025 When a young woman (Michie Tomizawa) becomes the target of a powerful vampire lord, Count Lee (Seizô Katô) — first in a ruthless countryside attack, later an abduction — D takes it upon himself to save her. Declan Gallagher, Entertainment Weekly, 30 Oct. 2025 Part of the threat that these men posed was their ability to speak like reasonable politicians while effectively running a ruthless terrorist campaign. The New Yorker, New Yorker, 29 Oct. 2025 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 6 Nov. 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

Last Updated: - Definition revised
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