Source : Webster's Revised Unabridged Dictionary (1913)

Subconscious \Sub*con"scious\, a.
   1. Occurring without the possibility or the fact of an
      attendant consciousness; -- said of states of the soul.

   2. Partially conscious; feebly conscious.

Source : WordNet®

subconscious
     n : psychic activity just below the level of awareness [syn: {subconscious
         mind}]

subconscious
     adj : just below the level of consciousness