Unruffled (adjective)

1. Not rough or disturbed.
2. Calm and composed.

Origin:

From the latin word 'inrufus' meaning 'not rough or disturbed'.

Examples:

1. Despite the chaos around him, he remained unruffled and composed.
2. The ocean was unruffled and calm, with not a single wave in sight.
3. She was unruffled by the news and took it in stride.
4. The plan was unruffled and went smoothly, with no unexpected surprises.
5. He was unruffled by the pressure and performed well under stress.