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.
The film will chart the pursuit and capture of one of America’s most ruthless mobsters and serial killers by notorious DEA Agent Jim Hunt (who also helped take down El Chapo) played by Paul Walter Hauser (Black Bird). Andreas Wiseman, Deadline, 27 Mar. 2026 Typewriters, stationery, fine-art museums, the quintessential impressionist painter—these are all associated with taste, beauty, and craft, as well as with intentionality and care, the opposite of the ruthless technological efficiency that repels many from generative AI. Matteo Wong, The Atlantic, 25 Mar. 2026 Even if the film doesn’t co-sign her ideology, Ursula is the most nuanced of the ruthless killers, and Gellar is adept at digging into the character’s ambiguity and shifting priorities. Louis Peitzman, Vulture, 20 Mar. 2026 The film centers on a car rental company owner who accidentally witnesses a murder, making him and his family targets of a ruthless gang. Naman Ramachandran, Variety, 17 Mar. 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 1 Apr. 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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