1. 不自在的；不安的；尴尬的
    If you are uncomfortable, you are slightly worried or embarrassed, and not relaxed and confident.

    e.g. The request for money made them feel uncomfortable...
           索要金钱让他们有些不安。
    e.g. If you are uncomfortable with your counsellor or therapist, you must discuss it...
           如果面对咨询顾问或治疗师时你觉得不自在，一定要提出来。

2. 不舒服的；不舒适的
    Something that is uncomfortable makes you feel slight pain or physical discomfort when you experience it or use it.

    e.g. Wigs are hot and uncomfortable to wear constantly...
           头上老是顶着假发，又热又不舒服。
    e.g. The Metro journey back to the centre of the town was hot and uncomfortable.
           乘地铁返回市中心又热又不舒服。

3. 身体不适的；不舒服的
    If you are uncomfortable, you are not physically content and relaxed, and feel slight pain or discomfort.

    e.g. I sometimes feel uncomfortable after eating in the evening...
           我晚上吃完饭有时会觉得不舒服。
    e.g. People living or working with smokers can find it uncomfortable to wear contact lenses because the smoke causes irritation.
           与吸烟者一起生活或工作的人会发现戴隐形眼镜不舒服，因为烟具有刺激作用。

4. （处境、事实等）令人不快的，令人担忧的，令人不安的
    You can describe a situation or fact as uncomfortable when it is difficult to deal with and causes problems and worries.

    e.g. It is uncomfortable to think of our own death, but we need to...
           想到人终有一死会感到不舒服，但我们不得不去面对。
    e.g. Such questions are uncomfortable to answer...
           这些问题让人很难回答。