1. 没有人;无人
    Nobody means not a single person, or not a single member of a particular group or set.

    e.g. They were shut away in a little room where nobody could overhear...
           他们被关在一个小屋里，没人能听到他们的动静。
    e.g. Nobody realizes how bad things are...
           没人意识到事情是多么糟糕。

2. 无名之辈;小人物
    If someone says that a person is a nobody, they are saying in an unkind way that the person is not at all important.

nobody在线翻译

    e.g. A man in my position has nothing to fear from a nobody like you.
           处在我这样位置的人，一点都不害怕像你这种小人物。