composure
n. uncountablen. the state of being calm and in control of your feelings, even in a difficult situation. It means you are not letting stress or anger show on your face or in your actions.
n. the state of being calm and in control of one's emotions. Often refers to maintaining a steady outward appearance during stressful or provocative circumstances.
She kept her composure during the difficult interview.
Despite the aggressive questioning from the reporters, the politician never lost his composure.
Maintaining one's composure in the face of public criticism is often cited as the hallmark of a seasoned leader, as it prevents minor setbacks from escalating into full-blown crises.
From compose + -ure.
Commonly used with the verbs 'keep', 'maintain', 'lose', or 'regain'.