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Synonyms

ruthless

American  
[rooth-lis] / ˈruθ lɪs /

adjective

  1. without pity or compassion; cruel; merciless.

    a ruthless tyrant.

    Synonyms:
    relentless, adamant, unrelenting

ruthless British  
/ ˈruːθlɪs /

adjective

  1. feeling or showing no mercy; hardhearted

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Related Words

See cruel.

Other Word Forms

  • ruthlessly adverb
  • ruthlessness noun

Etymology

Origin of ruthless

First recorded in 1300–50; Middle English; ruth + -less

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Ursula has shades of Gellar’s famous characters — Buffy’s physical ferocity, Kathryn Merteuil’s ruthless cattiness, Daphne Blake’s affinity for mysterious games — but doesn’t play to one exclusively.

From Salon • Mar. 26, 2026

Salah possessed the selfish, ruthless streak that is common among all the greats, but the assists figure alone demonstrates he was also a team contributor.

From BBC • Mar. 24, 2026

David Simon, whose ruthless negotiating tactics, obsession with details and sheer force of will turned his family’s real-estate business into the largest mall owner in the country, died Sunday after a cancer diagnosis in 2024.

From The Wall Street Journal • Mar. 23, 2026

David Plotz: Do you get the sense that Lachlan has the ruthless brilliance and the eye for talent that Rupert Murdoch has had?

From Slate • Mar. 21, 2026

“My pirate crew were a ruthless, bowlegged lot, but they taught me all a fellow needs to know about thievery. Let me have a crack at stealing it.”

From "The Interrupted Tale" by Maryrose Wood