» See also Unconscious mind. Unconsciousness, more appropriately referred to as loss of consciousness or lack of consciousness,'s a dramatic alteration of mental state that involves complete or near-complete lack of responsiveness to people and other environmental stimuli. Being in a comatose state or coma's an illustration of unconsciousness. Fainting due to a drop in blood pressure and a decrease of the oxygen supply to the brain's an illustration of a temporary loss of consciousness. Loss of… (More on Unconsciousness)