American English

Definition of ruthless adjective from the Oxford Advanced American Dictionary

 

ruthless

 adjective
adjective
NAmE//ˈruθləs//
 
(disapproving)
 
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(of people or their behavior) hard and cruel; determined to get what you want and not caring if you hurt other people a ruthless dictator The way she behaved toward him was utterly ruthless. He has a ruthless determination to succeed. We'll have to be ruthless if we want to make this company more efficient.
 
adverb I have to be ruthlessly honest with you.
ruthlessness
 
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noun [uncountable]
See the Oxford Advanced Learner's Dictionary entry: ruthless