1. （文字或言语）含糊的，不明确的，不清楚的
    If something written or spoken is vague, it does not explain or express things clearly.

    e.g. A lot of the talk was apparently vague and general...
           很多话明显是些含糊的泛泛之论。
    e.g. The description was pretty vague.
           描述相当模糊。

2. （记忆或想法）模糊的，不清晰的
    If you have a vague memory or idea of something, the memory or idea is not clear.

    e.g. They have only a vague idea of the amount of water available...
           他们只是大概知道可用水的总量。
    e.g. Waite's memory of that first meeting was vague.
           韦特对第一次见面的记忆很模糊。

3. 含糊其词的;闪烁其词的
    If you are vague about something, you deliberately do not tell people much about it.

    e.g. He was vague, however, about just what U.S. forces might actually do...
           然而，他对美军实际可能采取的行动却闪烁其词。
    e.g. Democratic leaders under election pressure tend to respond with vague promises of action...
           民主党领导人在选举压力下往往用一些含糊其词的行动承诺来予以回应。

4. 思维不清的
    If you describe someone as vague, you mean that they do not seem to be thinking clearly.

    e.g. She had married a charming but rather vague Englishman...
           她嫁给了一个外表迷人实际却很迷糊的英国人。
    e.g. His eyes were always so vague when he looked at her.
           他看她的眼神总是那么暧昧。

5. （感觉等）轻微的，隐约的
    If something such as a feeling is vague, you experience it only slightly.

vague的反义词

    e.g. He was conscious of that vague feeling of irritation again...
           他再次感到有点儿恼火。
    e.g. He had a vague impression of rain pounding on the packed earth.
           他隐约记得雨点打在坚实地面上的情景。

6. （外形或轮廓)模糊的，蒙眬的
      A vague shape or outline is not clear and is therefore not easy to see.

      e.g. He looked at her vague shape through the frosted glass...
             他透过雾蒙蒙的眼镜注视着她模糊的身形。
      e.g. The bus was a vague shape in the distance.
             远处的公交车只是一个模糊的轮廓。