scruples

I had no scruples about eavesdropping.

我对偷听没有丝毫顾忌。

The villain made no scruple of committing murder.

那棍杀人不眨眼。

A man who could make so vile a pun would not scruple to pick a pocket.

一个能说出劣双关语的人，是不会对偷窃钱包感到不安的。

He acted wrongly and without scruple.

他做了错事毫不内疚。