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Synonyms for Unconscious (same or very similar meaning)

WordNet sense 1 (that part of the mind wherein psychic activity takes place of which the person is unaware):
unconscious mind

WordNet sense 2 (not subject to the control of the will):
nonvoluntary, unvoluntary

WordNet sense 3 (just below the level of consciousness):

WordNet sense 4 (concerning mental functioning that is not represented in consciousness):

WordNet sense 5 (knocked unconscious by a heavy blow):
out, stunned

WordNet sense 6 (unresponsive to stimulation):
insensible, senseless

WordNet sense 7 (in a state of deep and usually prolonged unconsciousness; unable to respond to external stimuli):

WordNet sense 8 (unconscious from a blow or shock or intoxication):

WordNet sense 9 ((often followed by `of') not aware):
unaware, incognizant

From the ODE community, based on WordNetadd/edit