adrift, afloat, agnostic, alternating, ambiguous, ambitendent, ambivalent, amorphous, at loose ends, brittle, capricious, chancy, changeable, changeful, coquettish, corruptible, deciduous, derelict, desultory, deviable, dicey, disaffected, disloyal, dizzy, double-minded, doubting, dubious, dying, eccentric, ephemeral, equivocal, erratic, evanescent, faddish, fading, faithless, false, fanciful, fast and loose, fence-sitting, fence-straddling, fitful, fleeting, flickering, flighty, flirtatious, flitting, fluctuating, fly-by-night, flying, fragile, frail, freakish, frivolous, fugacious, fugitive, giddy, hesitant, hesitating, impermanent, impetuous, impulsive, incalculable, inconsistent, inconstant, indecisive, indemonstrable, infirm, infirm of purpose, insubstantial, irregular, irresolute, irresolved, irresponsible, light, lubricious, mazy, mercurial, momentary, moody, mortal, mugwumpian, mugwumpish, mutable, nondurable, nonpermanent, not true to, of bad faith, of two minds, passing, perishable, polysemous, quicksilver, rambling, recreant, restless, roving, scatterbrained, shapeless, shifting, shifty, short-lived, shuffling, skeptical, skittish, spasmodic, spineless, temperamental, temporal, temporary, ticklish, touch-and-go, toying, transient, transitive, transitory, trothless, unaccountable, uncertain, unconfirmable, uncontrolled, unconvinced, undecided, undependable, undetermined, undisciplined, undivinable, undurable, unenduring, unfaithful, unfixed, unforeseeable, unloyal, unpersuaded, unpredictable, unprovable, unreliable, unresolved, unrestrained, unsettled, unstable, unstable as water, unstaid, unsteadfast, unsteady, unsure, untrue, untrustworthy, unverifiable, vacillating, vagrant, variable, versatile, vicissitudinary, vicissitudinous, volatile, wandering, wanton, wavering, wavery, wavy, wayward, whimsical, wishy-washy