The antonym for ‘conscious’ is ‘unconscious’.
Being conscious refers to a state of awareness of one’s surroundings, thoughts, and feelings. It describes an active state where a person is alert and responsive. In contrast, when someone is unconscious, they are not aware of themselves or their environment, which can happen during sleep, medical conditions, or due to certain substances. Understanding these terms helps clarify the difference between being aware and being in a state where awareness is absent.