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Definition of fleeting : 1. of Fleet
2. Passing swiftly away; not durable; transient; transitory; as, the fleeting hours or moments.

Synonyms:

inconstant, variable, deciduous, flying, short, flash, floating, moving, fugitive, fleet, momentaneous, fugacious, time, continue

capricious (part of speech: adjective)

frivolous, fluctuating, scatterbrained, vacillating, fitful, fly-by-night, erratic, changeable

transient (part of speech: adjective)

meteoric, shifting, temporary, sudden, transitory, instantaneous, fading, restless, temporal, brief, transient, mortal, rootless, momentary, ephemeral, short-lived, flickering, swift, passing, impermanent, mutable, vanishing, evanescent, cursory, short-term

motiveless (part of speech: adjective)

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

Usage examples: