Synonyms and related words :
adrift, afloat, alternating, amorphous, capricious, changeable, changeful, coquettish, dangerous, desultory, deviable, disreputable, dizzy, doubtful, dubious, eccentric, erratic, faddish, faithless, FALSE, falsehearted, fast and loose, fickle, fitful, flickering, flighty, flimsy, flirtatious, flitting, fluctuating, fly-by-night, freakish, garbled, giddy, hazardous, impetuous, impulsive, inaccurate, inauthentic, inconsistent, inconstant, indecisive, inexact, infirm, insecure, insubstantial, irregular, irresolute, irresponsible, light, mazy, mercurial, miscited, misquoted, misreported, misstated, moody, perfidious, perilous, precarious, provisional, questionable, quicksilver, rambling, restless, risky, rocky, roving, scatterbrained, shaky, shapeless, shifting, shifty, shuffling, skittish, slick, slippery, spasmodic, spineless, spurious, temporary, tentative, ticklish, tottery, toying, treacherous, tricky, trustless, unaccountable, unassured, unauthentic, unauthoritative, uncertain, uncontrolled, undependable, undisciplined, unfaithful, unfaithworthy, unfixed, unfounded, unhealthy, unpredictable, unrestrained, unsafe, unsettled, unsolid, unsound, unstable, unstable as water, unstaid, unsteadfast, unsteady, unsubstantial, unsure, untrue, untrustworthy, untrusty, vacillating, vagrant, variable, versatile, vicissitudinary, vicissitudinous, volatile, wandering, wanton, wavering, wavery, wavy, wayward, weak, whimsical, wishy-washy, workaday