
die Gelassenheit
composure
A state of inner calm, balance, and unconcern, especially in stressful or difficult situations.
Trotz des Chaos bewahrte sie eine bewundernswerte Gelassenheit.
Despite the chaos, she maintained an admirable composure.
composure / serenity
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composure
A state of inner calm, balance, and unconcern, especially in stressful or difficult situations.
Trotz des Chaos bewahrte sie eine bewundernswerte Gelassenheit.
Despite the chaos, she maintained an admirable composure.
The noun 'Gelassenheit' (composure / serenity) is derived from the adjective 'gelassen' (calm, relaxed). The ending '-heit' is often used to turn an adjective into a noun that describes the state or quality.
Er ist ein sehr gelassener Mensch.
He is a very calm person.
'Gelassenheit' (composure) is often combined with certain verbs. Typical phrases are 'Gelassenheit bewahren' (to keep one's composure / to stay calm), 'Gelassenheit ausstrahlen' (to radiate calm), or 'etwas mit Gelassenheit nehmen' (to take something calmly).
Versuche, auch in stressigen Momenten deine Gelassenheit zu bewahren.
Try to keep your composure even in stressful moments.
To describe the kind of composure, adjectives such as 'innere' (inner), 'äußere' (outward), 'olympische' (Olympian), or 'bewundernswerte' (admirable) are often used.
Yoga hilft mir, meine innere Gelassenheit zu finden.
Yoga helps me find my inner serenity.
quiet / calm
Ruhe and Gelassenheit can both describe composed behavior under stress. Ruhe bewahren emphasizes controlling one's immediate reactions. Gelassenheit refers more strongly to the inner attitude with which someone accepts difficulties calmly.

Als sich die Ankunft verzögerte, nahm Mia das mit Gelassenheit hin.
When the arrival was delayed, Mia took it in stride.
Als der Zug plötzlich stehen blieb, bewahrte Mia die Ruhe.
When the train suddenly stopped, Mia kept calm.