Synonyms and related words :
adrift, afloat, alternating, amorphous, bent, billowing, billowy, capricious, changeable, changeful, curvaceous, curvate, curvated, curve, curved, curvesome, curviform, curvilineal, curvilinear, curving, curvy, desultory, deviable, dizzy, eccentric, erratic, fast and loose, fickle, fitful, flickering, flighty, flitting, fluctuating, freakish, geosynclinal, giddy, impetuous, impulsive, inconsistent, inconstant, incurvate, incurvated, incurved, incurving, indecisive, infirm, irregular, irresolute, irresponsible, labyrinthine, mazy, meandering, mercurial, moody, rambling, recurvate, recurvated, recurved, recurving, restless, rolling, roving, scatterbrained, serpentine, shapeless, shifting, shifty, shuffling, sinuous, spasmodic, spineless, surgy, tortuous, unaccountable, uncertain, uncontrolled, undependable, undisciplined, undulant, undulate, undulated, undulating, undulative, undulatory, unfixed, unpredictable, unreliable, unrestrained, unsettled, unstable, unstable as water, unstaid, unsteadfast, unsteady, vacillating, vagrant, variable, vicissitudinary, vicissitudinous, volatile, wandering, wanton, wavering, wavery, wayward, whimsical, wishy-washy