Synonyms and related words :
adrift, afloat, airborne, alternating, amorphous, brittle, capricious, changeable, changeful, circumforaneous, corruptible, deciduous, desultory, deviable, discursive, divagatory, dizzy, drifting, dying, eccentric, ephemeral, errant, erratic, evanescent, fading, fast and loose, fickle, fitful, fleeting, flickering, flighty, floating, fluctuating, fluttering, fly-by-night, flying, footloose, footloose and fancy-free, fragile, frail, freakish, fugacious, fugitive, gadding, giddy, gliding, gypsy-like, gypsyish, hovering, impermanent, impetuous, impulsive, inconsistent, inconstant, indecisive, infirm, insubstantial, irregular, irresolute, irresponsible, jet-propelled, landloping, mazy, meandering, mercurial, migrational, migratory, momentary, moody, mortal, mutable, nomad, nomadic, nondurable, nonpermanent, passing, perishable, rambling, ranging, restless, roaming, rocket-propelled, roving, scatterbrained, shapeless, shifting, shifty, short-lived, shuffling, spasmodic, spineless, straggling, straying, strolling, temporal, temporary, traipsing, transient, transitive, transitory, transmigratory, unaccountable, uncertain, uncontrolled, undependable, undisciplined, undurable, unenduring, unfixed, unpredictable, unreliable, unrestrained, unsettled, unstable, unstable as water, unstaid, unsteadfast, unsteady, vacillating, vagabond, vagrant, variable, vicissitudinary, vicissitudinous, volant, volatile, volitant, wandering, wanton, wavering, wavery, wavy, wayward, whimsical, winging, wishy-washy