unconscious /unkon″shəs/ [ME, un + L, conscire, to be aware] , 1. unaware of the surrounding environment; insensible; incapable of responding to sensory stimuli. 2. (in psychiatry) the part of the mental function in which thoughts, ideas, emotions, or memories are beyond awareness and rarely subject to ready recall. It contains data that have never been conscious or that were conscious at one time, usually for a brief period, and later repressed. Compare preconscious. See also collective unconscious, personal unconscious.
