for conscience' sake

1. 為了良心上過得去
   She returned the money to him for conscience' sake.

   為了良心上過得去，她把錢還給了他。

have no conscience

1. 沒有良心；不辨是非
   How could he have done such harm to her! He's got no conscience at all.

   他怎麼能這樣傷害她！他真是一點良心也沒有。

have the conscience to do sth.

1. 厚著臉皮做某事
   He had the conscience to do such a thing.

   他竟有臉做這種事！

in all conscience

1. 憑良心
   He couldn't do such a thing in all conscience.

   從良心上來講，他不能做這種事。

on one's conscience

1. 問心有愧
   How could he live peacefully with such a wicked crime on his conscience?

   他做了這樣傷天害理的事怎麼能過太平的日子呢？

• in (all) conscience
  in fairness.
• on one's conscience
  causing feelings of guilt.