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.
With her Demonic transformation, Rauch added a whole new shade of dark to Big Bang alums’ returns for the spinoff, following Kaley Cuoco’s ruthless Penny in Episode 2 and Kunal Nayyar’s deeply depressed Raj in Episode 1. Nellie Andreeva, Deadline, 6 Aug. 2026 Through remarkable archival footage and an incredible range of interviews, Monsters of God digs into the egotistical and ruthless mentalities that supported competing criminal empires and the undercover operations that dismantled them. Rory Doherty, Time, 6 Aug. 2026 His feelings for these boys are described with a soul-baring softness, especially striking for its divergence from Ellis’s usual ruthless unsentimentality. Leo Lasdun, New Yorker, 5 Aug. 2026 Though the storylines are different in the two adaptations, both involve a scary, ruthless Max Cady who is out for revenge. Benjamin Vanhoose, PEOPLE, 31 July 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 11 Aug. 2026.

Kids Definition

ruthless

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

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