Synonyms and related words :
adrift, afloat, alternating, amorphous, capricious, changeable, changeful, dangerous, derelict, desultory, deviable, disaffected, disloyal, dizzy, eccentric, erratic, faithless, FALSE, fast and loose, fickle, fitful, flickering, flighty, flitting, fluctuating, freakish, giddy, hazardous, impetuous, impulsive, inconsistent, inconstant, indecisive, infirm, insecure, insubstantial, irregular, irresolute, irresponsible, mazy, mercurial, mobile, moody, moving, not true to, of bad faith, perilous, precarious, provisional, rambling, recreant, restless, risky, roving, scatterbrained, shaky, shapeless, shifting, shifty, shuffling, slippery, spasmodic, spineless, temporary, tentative, ticklish, treacherous, trothless, unaccountable, uncertain, uncontrolled, undependable, undisciplined, unfaithful, unfaithworthy, unfixed, unloyal, unpredictable, unreliable, unrestrained, unsettled, unsolid, unsound, unstable, unstable as water, unstaid, unsteady, unsubstantial, unsure, untrue, untrustworthy, vacillating, vagrant, variable, vicissitudinary, vicissitudinous, volatile, wandering, wanton, wavering, wavery, wavy, wayward, whimsical, wishy-washy