adrift afloat alternating amorphous capricious changeable changeful coquettish dangerous desultory deviable dizzy doubtful dubious eccentric erratic faddish fast and loose fickle fitful flickering flighty flirtatious flitting fluctuating fly-by-night freakish giddy hazardous impetuous impulsive inconsistent inconstant indecisive infirm insecure insubstantial irregular irresolute irresponsible light mazy mercurial moody perilous precarious provisional quicksilver rambling restless risky rocky roving scatterbrained shaky shapeless shifting shifty shuffling skittish slippery spasmodic spineless temporary tentative ticklish tottery toying treacherous tricky trustless unaccountable uncertain uncontrolled undisciplined unfaithworthy unfixed unhealthy unpredictable unreliable unrestrained unsafe unsettled unsolid unsound unstable unstable as water unstaid unsteadfast unsteady unsubstantial unsure untrustworthy untrusty vacillating vagrant variable versatile vicissitudinary vicissitudinous volatile wandering wanton wavering wavery wavy wayward whimsical wishy-washy