Etymology
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flighty (adj.)

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.

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Definitions of flighty

flighty (adj.)
guided by whim and fancy;
flighty young girls
Synonyms: flyaway / head-in-the-clouds / scatterbrained
flighty (adj.)
unpredictably excitable (especially of horses);
Synonyms: skittish / spooky / nervous
From wordnet.princeton.edu