Her husband is a hard hearted man.

她丈夫是个铁石心肠的人。

youdao

You would have to be pretty hard-hearted not to feel something for him.

你必须是非常铁石心肠才能对他没有一点同情。

《柯林斯英汉双解大词典》

In a final pair of experiments, the scientists tested metaphors like "hard-hearted" and "she's a rock" by first having people touch either a wooden block or a soft blanket as part of a magic trick.

在最后一组实验中，科学家测试诸如“铁石心肠”、“她像块石头”这类比喻。首先，作为魔术的一部分，人们先是触摸一个木块或是一张柔软的毯子。

youdao

In your pain and sadness, you may decide that the person you loved is hard-hearted, and in fact,has a heart of stone.

VOA: special.2010.07.18

The sound-money advocates are often portrayed as hard-hearted Scrooges, preventing assistance to the destitute.

FORBES: Ask Greek Citizens About Soft (Drachma) Money, And If They Like It

Contrary to the liberal stereotype of the hard-hearted right-winger, opposition to income-leveling is not evidence that one does not care about others.

WSJ: Arthur C. Brooks: Tea Partiers and the Spirit of Giving

But they are not being totally hard-hearted about pipers and kilt wearers.

BBC: News | Scotland | Ban bagpipes and kilts, says Englishman