a.

1. 不省人事的，失去知觉的
   He injured his head and was unconscious for one hour.

   他伤着了头部，一个小时没有知觉。

2. 不知道的，未发觉的[F][（+of）]
   They were so quiet that he was completely unconscious of their presence.

   他们非常安静，他完全不知道他们在场。

3. 无意识的，不知不觉的
   an unconscious error

   无意识犯的错误

n.

1. 【心】无意识[the S]

adj.

1. not awake and aware of and responding to one's environment.
2. done or existing without one realizing.
3. (unconscious of) unaware of.

n.