从容不迫的
沉稳的
free from emotional agitation or nervous tension
同义词： unflurried / unperturbed / unruffled
... 不稳性 instability 沉稳 calm; unflustered; steady 搭把手 to help out ...
Mr Obama's performance during all this was remarkable. He remained calm and unflustered.
然而，奥巴马在整场辩论中表现十分出色，始终保持冷静从容。
The film may be humorless, unflustered by the need to quicken or amuse, but it feels unfashionably true to itself.
He seemed perfectly unflustered, if anything slightly cross at having been disturbed.
Another figure who looks unflustered is Boris Berezovsky, perhaps Russia's biggest tycoon and best-known manipulator, who has been ostentatiously close to Mr Chernomyrdin this week.