scruple

他对欺骗客户的行为毫无顾忌。

He has no ___scruples about deceiving his clients.

如果发现自己的兄弟在挪用资金，她会毫不犹豫地举报他。

She would not ___scruple to report her own brother if she discovered he was embezzling funds.

在接受这份礼物时，她心中闪过一丝道德上的顾虑，然后礼貌地拒绝了。

A momentary ___scruple about accepting the gift passed through her mind before she politely declined.