He ran the company with ruthless efficiency. 他以铁面无情的高效率经营这家公司。
Throw away clothes you don’t wear — be ruthless. 把你不穿的衣服扔掉——要坚决。
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。