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Definition of volatile : 1. A winged animal; wild fowl; game.
2. Capable of wasting away, or of easily passing into the aeriform state; subject to evaporation.
3. Fig.: Light- hearted; easily affected by circumstances; airy; lively; hence, changeable; fickle; as, a volatile temper.
4. Passing through the air on wings, or by the buoyant force of the atmosphere; flying; having the power to fly.

Synonyms:

vapory, temperamental, quicksilver, teasing, vivacious, heavy, ticklish, unpredictable, animated, subtle, dense, volatilizable, playful, lively, light, airy, demure, active, vaporous, buoyant, sprightly, effervescent, expansive, solemn, vaporific, gay, gaseous, change, imponderable, vaporizable, fantastical, freakish, volatilisable, continue, merry, resilient, flippant, fantastic, evaporable, happy

irresolute (part of speech: adjective)

insipid, tentative, unwilling, undependable, weak, infirm, halfhearted, shy, unsure, dillydallying, watery, shifty, spineless, irresponsible, erratic, uncertain, hesitant, unresolved, shrinking, inconsistent, shilly-shally, yellow, fly-by-night, double-minded, undecided

excitable (part of speech: adjective)

explosive, passionate, stormy, reckless, touchy, excitable, crusty, irritable, short-tempered, ardent, tempestuous, fragile, nervous, fiery, combustible, quick-tempered, edgy, sensitive, hot-tempered, emotional, high-strung, volcanic, cranky, brittle, rash

motiveless (part of speech: adjective)

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

transient (part of speech: adjective)

impermanent, fading, temporal, short-lived, rootless, cursory, momentary, brief, flickering, instantaneous, transient, passing, mortal, ephemeral, transitory, short-term, temporary, evanescent

changeable (part of speech: adjective)

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

fickle (part of speech: adjective)

plastic, permutable, pliable, pliant, unreliable, malleable

capricious (part of speech: adjective)

fluctuating, fitful, scatterbrained, frivolous

Usage examples: