cold-blooded

• In the service of his beliefs, he could be cold-blooded and ruthless; he was incredibly persistent .
  为了他的信念，他可以冷酷无情，他百折不挠到了令人难以置信的程度。
• We possessed neither the conceptual nor the historical framework for so cold-blooded a policy .
  我们既缺乏这种观念上的素养，也没有这种历史上的背景来采取如此冷静的政策。
• Never in my life have i heard such sheer legal cynicism, such a cold-blooded and calculated attempt to bedevil and evade the law in my life !
  我这一辈子还从未听到过像这样在法律上玩世不恭，这样冷酷地，处心积虑地妄图破坏和逃避法律的行为。