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unruffled (adj.)
[unruffled 词源字典]
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.
[unruffled etymology, unruffled origin, 英语词源]
[unruffled 词源字典]