Deep Unconsciousness is a state of unconsciousness caused by a severe injury or illness. It is also known as a COMA, which is a four-letter word that is one of the solutions to the crossword. COMA is a medical term used to describe a state of profound unconsciousness in which a person cannot be aroused, even by painful stimuli. It can be caused by a variety of conditions, including head trauma, stroke, drug overdose, and metabolic disturbances. In some cases, it can last for days, weeks, or even months. Treatment for a COMA depends on the underlying cause and may include medications, surgery, or other interventions.