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.
Pursued by both the FBI and a ruthless crime boss (Bening), Lucky must fight for her life — and a way out. Dessi Gomez, Deadline, 3 Feb. 2026 But, in contrast, countries controlled by ruthless leaders have no qualms about stripping citizens of basic dignity. Sasha Abramsky, Washington Post, 2 Feb. 2026 In its sophomore season, Cross is in pursuit of a ruthless vigilante who is hunting down corrupt billionaire magnates. Jessica Radloff, Glamour, 1 Feb. 2026 Mendonça was born in 1968, in the early years of a ruthless military dictatorship—a time when cinema, like much else, was harshly constrained. Stephania Taladrid, New Yorker, 1 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

Browse Nearby Words

Podcast

Cite this Entry

“Ruthless.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/ruthless. Accessed 7 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

Last Updated: - Updated example sentences
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