accidental, adventitious, adventurous, aleatory, blue, broad, casual, causeless, chance, chancy, contingent, dangerous, delicate, destinal, desultory, dicey, fatal, fatidic, fluky, fortuitous, full of risk, hairy, hazardous, iffy, incidental, indeterminate, infirm, insecure, insubstantial, jeopardous, off-color, on thin ice, perilous, precarious, provisional, racy, riskful, risque, salty, scabrous, sensitive, shady, shaky, shifting, shifty, slippery, speculative, spicy, suggestive, temporary, tentative, ticklish, touch-and-go, touchy, treacherous, uncaused, uncertain, undependable, undetermined, unexpected, unfaithworthy, unforeseeable, unforeseen, unhealthy, unlooked-for, unpredictable, unreliable, unsolid, unsound, unstable, unsteadfast, unsteady, unsubstantial, unsure, untrustworthy, venturesome, venturous, wicked, wildcat