Equanimity (noun)

1. The quality of being calm and composed, even in difficult or trying situations.
2. The state of being mentally or emotionally balanced and steady.

Origin:

From the latin word aequanimitas, which means "evenness of mind".

Examples:

1. He faced the crisis with equanimity.
2. She accepted the news with equanimity.
3. He approached the challenge with equanimity.
4. The leader remained calm and composed, showing equanimity.
5. She maintained her equanimity despite the overwhelming stress.