What condition is characterized by an inability to be aroused and unresponsiveness to all stimuli?

The condition characterized by an inability to be aroused and unresponsiveness to all stimuli is known as being comatose. This state indicates a profound level of unconsciousness where the individual cannot be awakened, does not respond to painful stimuli, and does not exhibit purposeful movements.

In contrast, other states such as stupor indicate a reduced responsiveness but may still allow for some arousal with significant stimulation. Being awake simply means that a person is alert and aware, while somnolent refers to a drowsy state in which a person may fall asleep easily but can still be awakened. Therefore, the distinguishing factor for a comatose state is the complete lack of responsiveness and the inability to be aroused, setting it apart from the other conditions listed.