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.
The club and Ayto wanted to show respect to Weir, with his departure still raw, but the former centre-back has been in football long enough to appreciate the ruthless nature of the game and Brighton are renowned for their planning. Andy Naylor, New York Times, 14 Sep. 2025 Tracey recalls how her ruthless daughter sought revenge on her father, classmates and Laura. Erin Jensen, USA Today, 12 Sep. 2025 In the epic Emperor Kisra (Kingsley) has a reputation for being utterly ruthless. Nick Vivarelli, Variety, 12 Sep. 2025 Blyth provides a fitting foil to Jonsson’s softness with his endless spring of ruthless aggression, forcing Taylor’s primal survival instincts to butt against his more civilized sense that there has to be something more for him in this world. Christian Zilko, IndieWire, 12 Sep. 2025 See All Example Sentences for ruthless

Word History

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 17 Sep. 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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