unconscious
noun
that part of the mind wherein psychic activity takes place of which the person is unaware
Synonymsunconscious mind
adjective
not conscious; lacking awareness and the capacity for sensory perception as if asleep or dead
“lay unconscious on the floor”
Oppositesconsciouswithout conscious volition
(followed by `of') not knowing or perceiving
“happily unconscious of the new calamity at home”
Source: WordNet 3.1, Princeton University