1650s in figurative sense, from un- (1) "not" + past participle of ruffle (v.). Literal meaning, in reference to feathers, leaves, etc., is recorded from 1816.
实用例句
1. Anne had remained unruffled, very cool and controlled.
安妮处乱不惊，十分冷静沉着。
来自柯林斯例句
2. He remained unruffled by their accusations.
对于他们的指控他处之泰然。
来自《权威词典》
3. She spoke with unruffled calm.
她从容不迫地讲话.
来自《简明英汉词典》
4. He remained unruffled by the charges.
他受到这些指控仍处之泰然.
来自《简明英汉词典》
5. When coming across complicated problems, he would remain unruffled and take them calmly.