Final answer:
Neuroticism is the supertrait that deals with emotional stability and describes an individual as being calm or anxious.
Step-by-step explanation:
The supertrait that deals with emotional stability and describes an individual as being calm or anxious is neuroticism. People who score high on neuroticism tend to experience emotional instability and are characterized as angry, impulsive, and hostile. On the other hand, individuals who score low in neuroticism tend to be calm and even-tempered.