Etymology
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unconscious (adj.)

1712, "unaware, not marked by conscious thought," from un- (1) "not" + conscious. Meaning "temporarily insensible, knocked out" is recorded from 1860. Related: Unconsciously; unconsciousness. In psychology, the noun the unconscious (1876) is a loan-translation of German das Unbewusste. The adjective in this sense is recorded from 1912.

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Definitions of unconscious
1
unconscious (adj.)
(followed by `of') not knowing or perceiving; "happily unconscious of the new calamity at home"- Charles Dickens;
unconscious (adj.)
not conscious; lacking awareness and the capacity for sensory perception as if asleep or dead;
lay unconscious on the floor
unconscious (adj.)
without conscious volition;
2
unconscious (n.)
that part of the mind wherein psychic activity takes place of which the person is unaware;
Synonyms: unconscious mind
From wordnet.princeton.edu