Unconscious/ʌnˈkɑːnʃəs/ Definition 1 of 3Pro Tip 1/2Physical State Describes someone not conscious due to impact or illness; can't respond to stimuli. After the car accident, he was found unconscious. Pro Tip 2/2Temporary Condition It usually means the person will regain awareness eventually, not a permanent state. The boxer was unconscious for a few minutes.