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.
Natural selection is usually ruthless about weeding out traits with no function. Scott Travers, Forbes.com, 2 July 2026 Supergirl builds to a final showdown with Krem of the Yellow Hills, the ruthless Brigands leader who murdered Ruthye’s family and poisoned Krypto early in the film. Lily Brown, PEOPLE, 26 June 2026 Canadian quartet Truck Violence have been sloshing together these subgenres in a ruthless manner for several years now, and their sophomore album and debut for the Flenser aims for even higher drops between those peaks and valleys. Hattie Lindert, Pitchfork, 25 June 2026 There was relative peace for 11 years, until a second civil war erupted in 1983, when leaders in Khartoum imposed sharia (Islamic) law and accelerated repression of the southern Christian rebels, which ultimately allowed a ruthless military officer, Omar al-Bashir, to come to power in 1989. Janine Di Giovanni, Vanity Fair, 25 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

Browse Nearby Words

Podcast

Cite this Entry

“Ruthless.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/ruthless. Accessed 5 Jul. 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

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

More from Merriam-Webster