Ruthless
Ruthless adjective - Having or showing a lack of sympathy or tender feelings.
Sly and ruthless are semantically related. In some cases you can use "Sly" instead an adjective "Ruthless".
Nearby Words: ruthlessly, ruth
Mutual synonyms
Both words in one sentence
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Sly Moorcock from Stark by Ben Elton is a ruthless billionaire who has no qualms about leaving Earth with the other billionaires and letting humanity die in the inevitable ecological breakdown.
Source: Alas, Poor Villain -
Moral Dissonance: Bentley's plans can sometimes be unnecessarily ruthless, ranging from feeding live Mooks to a crocodile to luring Sly's love interest into taking out local thugs for the gang.
Source: Franchise / Sly Cooper
Cite this Source
Sly and Ruthless. (2016). Retrieved 2026, August 07, from https://thesaurus.plus/related/ruthless/sly
Ruthless & Sly. N.p., 2016. Web. 07 Aug. 2026. <https://thesaurus.plus/related/ruthless/sly>.
Sly or Ruthless. 2016. Accessed August 07, 2026. https://thesaurus.plus/related/ruthless/sly.
Google Ngram Viewer shows how "ruthless" and "sly" have occurred on timeline