adjective
BAD : The driver of the car was taken to hospital subconscious.
GOOD : The driver of the car was taken to hospital unconscious.
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subconscious (of a thought or desire) = existing or occurring in the mind without the person being aware of it: 'His dream about crossing the ocean single-handed probably arose from a subconscious desire for fame.'
unconscious (of a person) = in a sleep-like state, especially because you are ill or have been hit on the head: 'The cleaner found him lying unconscious on the bathroom floor.'