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English definition of “ruthless”

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ruthless

adjective uk   /ˈruːθ.ləs/ us  
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.
ruthlessly
adverb uk   /-li/ us  
She ruthlessly pursued her ambition, letting nothing get in her way.
ruthlessness
noun [U] uk   /-nəs/ us  
(Definition of ruthless from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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