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.
Arsenal created more than enough to help themselves to a bunch of goals in Naples, only to get stuck in anti-ruthless mode. Amy Lawrence, New York Times, 9 Sep. 2026 Authorities raided the building and found the entrance to a tunnel controlled by the ruthless Jalisco New Generation Cartel. Steve Fisher, Los Angeles Times, 9 Sep. 2026 The anecdotes certainly are fun, but I was struck by the meat at the heart of it with its discussions of the politics — past and present — and on sexuality and race, and on the sometimes ruthless nature of building a national theater. Baz Bamigboye, Deadline, 4 Sep. 2026 He was always destined to follow in the footsteps of another tyrannical, ruthless Don – Michael Corleone. Aramide Tinubu, Variety, 3 Sep. 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 13 Sep. 2026.

Kids Definition

ruthless

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