/ˈruːθlɪs/
(disapproving)
(of people or their behaviour 人或行为) hard and cruel; determined to get what you want and not caring if you hurt other people 残酷无情的；残忍的
a ruthless dictator
残酷无情的独裁者
The way she behaved towards him was utterly ruthless.
她对待他真是无情至极。
He has a ruthless determination to succeed.
他有不获成功决不罢休的坚定决心。