a.

1. 不自然的，忸怩的，害羞的
   The young girl felt very self-conscious about the large mole on her chin.

   那位年轻姑娘对自己下巴上的一颗大痣感到很不自在。

2. 【哲】【心】有自我意识的，自觉的

adj.

1. nervous or awkward because unduly aware of oneself or one's actions.
2. (especially of an action) deliberate and with full awareness.
3. Philosophy  & Psychology  having knowledge of one's own existence, especially the knowledge of oneself as a conscious being.