What term describes the quality of calmness and composure in stressful situations?

The term that describes the quality of calmness and composure in stressful situations is equanimity. Equanimity refers specifically to a state of mental and emotional stability, especially during challenging or tumultuous circumstances. It embodies the ability to maintain a balanced mindset, regardless of external pressures or chaos, allowing an individual to remain focused and rational.

While serenity and tranquility also imply a sense of peace and calmness, they are more often associated with a general state of being rather than specifically addressing the response to stress or adversity. Composure suggests maintaining control of oneself during stressful moments but may not fully capture the deeper, more grounded quality that equanimity embodies. Therefore, equanimity is the most precise term for the ability to remain calm and composed specifically under stress.