ruthless

adjective

ruth·​less ˈrüth-ləs How to pronounce ruthless (audio)
also ˈru̇th-
Synonyms of ruthlessnext
: 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.
Days earlier, the longtime political grandee who had a reputation as a ruthless political fixer, had stepped down as a member of the House of Lords. Camille Behnke, NBC news, 23 Feb. 2026 The man behind one of Mexico's most ruthless cartels. Phaedra Trethan, USA Today, 23 Feb. 2026 Powerfully addictive crack cocaine swept though impoverished urban neighborhoods, empowering a new, more ruthless, better armed class of criminals, bringing predictable devastation. Clarence Page, Chicago Tribune, 22 Feb. 2026 But on Team Reggie, there’s no ruthless Jack Donaghy, no narcissistic Jenna Maroney. Judy Berman, Time, 20 Feb. 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 26 Feb. 2026.

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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