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Definition of flighty : 1. Fleeting; swift; transient.
2. Indulging in flights, or wild and unrestrained sallies, of imagination, humor, caprice, etc.; given to disordered fancies and extravagant conduct; volatile; giddy; eccentric; slighty delirious.

Synonyms:

light-minded, lighthearted, goofy, spasmodic, high-strung, flyaway, rattlebrained, scatty, schizoid, skittery, frothy, hyper, irresponsible, gaga, harebrained, hyperkinetic, empty-headed, fiddle-footed, head-in-the-clouds, ditzy, nervous, neural, featherbrained, birdbrained, unquiet, queasy, skittish, spooky, uneasy, futile, aflutter, ability, hyperexcitable, puerile, hyperactive, anxious, yeasty, jittery, schizophrenic, dizzy, jumpy, rattlepated, light-headed, fluttery

giddy, fly-by-night, scatterbrained, silly, fluctuating, frivolous, fitful, erratic

plastic, pliable, permutable, malleable, pliant, unreliable, undependable

flitting, rambling, unmethodical, spastic, wayward, fleeting, careless, motiveless, systemless, adrift, wandering, impulsive, nonsystematic, haphazard, arbitrary, random, chancy, sporadic, irregular, fanciful, indecisive, whimsical, capricious, ambivalent, reasonless

irresolute, unsteady, flexible, alterable, restless, adaptable, mercurial, unsettled, vacillating, modifiable, transposable, varying, precarious, movable, shifting, convertible, mutable, protean, wavering, variable, adjustable, inconstant, changeable, reformable, unstable, vicissitudinous, fickle, changeful, volatile, versatile, fluid, transformable, ever-changing

Usage examples:

• This we believe to be the real Gourgaud, a genuine, lovable, but flighty being, as every page of his " Journal" shows. - "The Life of Napoleon I (Volumes, 1 and 2)", John Holland Rose.
• By no means a learned man, yet with a sympathetic manner and a fund of quiet humour that attracted all who came under its influence, Galbraith was enabled to hold his flock together when their naturally flighty nature and mutual jealousies would have driven them to dissolve with curses. - "A Galahad of the Creeks; The Widow Lamport", S. (Sidney) Levett-Yeats.
• It is only the small men who laugh in the face of genuine enthusiasm, however wild and flighty it may seem. - "The Crime Doctor", Ernest William Hornung.