Meaning of “ruthless” in the English Dictionary

"ruthless" in British English

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uk /ˈruːθ.ləs/ us /ˈruːθ.ləs/

C2 not thinking or worrying about any pain caused to others; cruel:

ruthless ambition
a ruthless dictator
Some people believe that to succeed in this world you have to be ruthless.
adverb uk /ˈruːθ.lə us /ˈruːθ.lə

She ruthlessly pursued her ambition, letting nothing get in her way.
noun [ U ] uk /ˈruːθ.ləs.nəs/ us /ˈruːθ.ləs.nəs/

(Definition of “ruthless” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"ruthless" in American English

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us /ˈruθ·ləs/

cruel, or determined to succeed without caring about others:

a ruthless ruler
To compete abroad requires ruthless cost-cutting at home.

(Definition of “ruthless” from the Cambridge Academic Content Dictionary © Cambridge University Press)