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flighty (adj.)
[flighty 词源字典]
1550s, "swift," from
flight
(n.1) +
-y
(2). Sense of "fickle or frivolous" is from 1768, perhaps from notion of "given to 'flights' of imagination." Related:
Flightiness
.
[flighty etymology, flighty origin, 英语词源]
[flighty 词源字典]