"not have the heart to do" in Chinese (Traditional)
不忍心做（某事）
Definition
因害怕傷害或使別人難過，覺得無法去做某事，通常出於同情或憐憫。
Usage Notes (Chinese (Traditional))
這是口語用語，強調因感情、同情而無法做某事，不等同於害怕。常與“告訴”、“離開”等動詞搭配使用，表達感情上的不忍心。
Examples
I didn't have the heart to do it and make her cry.
我**不忍心做**這件事讓她哭。
He doesn't have the heart to do something so mean.
他**不忍心做**那麼狠的事。
She didn't have the heart to do what was needed.
她**不忍心做**需要做的事。
I just don't have the heart to do this to my best friend.
我真的**不忍心做**這種事對我最好的朋友。
She looked so happy, I didn't have the heart to do anything to ruin it.
她那麼開心，我**不忍心做**任何會破壞氣氛的事。
We didn't have the heart to do it, so we left the puppy with her.
我們**不忍心做**，所以把小狗留給了她。