If you describe someone as hard-hearted, you disapprove of the fact that they have no sympathy for other people and do not care if people are hurt or made unhappy.
例句
You would have to be pretty hard-hearted not to feel something for him.只有铁石心肠的人才会对他无动于衷。
英汉词典释义
adj.
无情的;冷酷的
Single men, though they may be many times more charitable, because their means are less exhaust, yet, on the other side, they are more cruel and hardhearted, because their tenderness is not so oft called upon.那种独身的人，虽然在用起来似很慷慨，但实际上往往是心肠很硬的，因为他们不懂得对他人的爱。