self-possessed 从容不迫

“从容不迫”，汉语成语，意思是遇事沉着，形容镇定自若，不慌不忙。可以翻译为“self-possessed，calm and unhurried”等。

例句：

这位演讲者风度老练，从容不迫。

The speaker was an experienced man, composed and steady.