ruthless

adjective

ruth·​less ˈrüth-ləs How to pronounce ruthless (audio)
also ˈru̇th-
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.
La Roja needs quicker movement of the ball and its players, more adaptation to what the opponent is doing (Saudi Arabia is not going to play free and open after seeing what worked) and to be more ruthless. Patrick Sung Cuadrado, CNN Money, 21 June 2026 Nolan faces the challenge of creating a hero for the multiplexes who is ruthless and at times cruel. David Denby, New Yorker, 21 June 2026 With such an inexperienced side on show, England looked disorganised and devoid of ideas as they were put to the sword by ruthless, relentless opponents. Hector Vickers, New York Times, 21 June 2026 Noah Thomas’s life takes a dangerous turn when a chance reunion with an old high school friend, Parker Coleman, entangles him in a ruthless crime ring. Jon Stojan, Variety, 18 June 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 28 Jun. 2026.

Kids Definition

ruthless

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

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