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unflappable (adj.)
[unflappable 词源字典]
1958, from
un-
(1) "not" +
flap
(v.) +
-able
. Originally used in reference to Harold Macmillan, British P.M. 1957-63.
[unflappable etymology, unflappable origin, 英语词源]
[unflappable 词源字典]