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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.
There’s greedy, ruthless, hypocritical Conkling, enriching himself by any means necessary. Judy Berman, Time, 28 Nov. 2025 More recently, the actor, who moved to Las Vegas in 1992, starred in Steven Soderbergh’s remake of Ocean’s Eleven, in which DeLano played a Las Vegas casino manager working for Andy Garcia’s ruthless character, Terry Benedict. Desiree Anello, PEOPLE, 26 Nov. 2025 Over two decades, Ryan Wedding went from a promising snowboarder competing in the Olympics to someone who officials have said is one of the most violent and ruthless criminals in the world, responsible for orchestrating murders and running a billion-dollar cocaine cartel. Kayla Hayempour, NBC news, 23 Nov. 2025 How ironic that the quirky Tennant would be the most ruthless? Devan Coggan, Entertainment Weekly, 23 Nov. 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 3 Dec. 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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