1. 良心;良知
    Your conscience is the part of your mind that tells you whether what you are doing is right or wrong. If you have a guilty conscience, you feel guilty about something because you know it was wrong. If you have a clear conscience, you do not feel guilty because you know you have done nothing wrong.

conscience在线翻译

    e.g. I have battled with my conscience over whether I should actually send this letter...
           我备受良心的煎熬，不知是否真的应该把这封信寄出去。
    e.g. What if he got a guilty conscience and brought it back?...
           要是他觉得内疚，把东西拿回来了怎么办？

2. 信仰；凭良心行事
    Conscience is doing what you believe is right even though it might be unpopular, difficult, or dangerous.

    e.g. He refused for reasons of conscience to sign a new law legalising abortion.
           他出于信仰，拒绝签署使堕胎合法化的新法。
    e.g. ...the law on freedom of conscience and religious organizations.
           有关信仰自由和宗教组织自由的法律

3. 内疚;良心不安
    Conscience is a feeling of guilt because you know you have done something that is wrong.

conscience的反义词

    e.g. I'm so glad he had a pang of conscience...
           我很高兴他会有负疚感。
    e.g. They have shown a ruthless lack of conscience.
           他们没有表现出丝毫内疚，实在是太无情了。

4. 凭良心;出于公道
    If you say that you cannot do something in all conscience ,in good conscience, or in conscience, you mean that you cannot do it because you think it is wrong.

    e.g. She could not, in good conscience, back out on her deal with him.
           凭良心她不能背弃与他达成的协议。

5. 内疚;良心不安
    If you have something on your conscience, you feel guilty because you know you have done something wrong.

conscience的反义词

    e.g. Now the murderer has two deaths on his conscience.
           现在，这个杀人犯背着两条人命，受到了良心的谴责。