1. 不省人事的；失去知觉的；神志不清的
    Someone who is unconscious is in a state similar to sleep, usually as the result of a serious injury or a lack of oxygen.

    e.g. By the time ambulancemen arrived he was unconscious...
           救护人员到达时他已经不省人事了。
    e.g. He was dragged from his van and beaten unconscious by a gang of salmon poachers.
           他被一帮盗猎大麻哈鱼的家伙从货车里拽出来打得不省人事。

2. 不知道的；未觉察的；没注意到的
    If you are unconscious of something, you are unaware of it.

    e.g. He himself seemed totally unconscious of his failure...
           他本人似乎对自己的失败全然不知。
    e.g. Mr Battersby was apparently quite unconscious of their presence.
           巴特斯比先生显然没有注意到他们在场。

3. 潜意识的；无意识的
    If feelings or attitudes are unconscious, you are not aware that you have them, but they show in the way that you behave.

    e.g. Unconscious envy manifests itself very often as this kind of arrogance...
           潜意识里的嫉妒常表现为这种傲慢自大。
    e.g. 'You're well out of it,' Christopher said with unconscious brutality.
           “幸亏没你什么事儿，”克里斯托弗无意中冷冷地说道。

4. 无意识
    Your unconscious is the part of your mind that contains feelings and ideas that you do not know about or cannot control.

    e.g. In examining the content of the unconscious, Freud called into question some deeply-held beliefs.
           在审视无意识的内容时，弗洛伊德对一些根深蒂固的看法提出了质疑。