Definitions:

1. Describes a state of deep unconsciousness in which a person cannot be awaken and does not respond to stimuli, typically as a result of a severe medical condition such as brain injury, drug overdose, or serious illness. NOUN
   • The comatoseness of the patient lasted several weeks, during which he showed no signs of consciosness.
2. Refers to the state or condition of being comatose. NOUN
   • Doctors are monitoring her comatoseness closely to determine the best course of treatment.

Synonyms:

• coma
• deep sleep
• unconsciousness