Synonyms and related words :
adventurous, aleatory, chancy, dangerous, desultory, dicey, dickey, fraught with danger, full of risk, hairy, infirm, insecure, insubstantial, jeopardous, parlous, perilous, precarious, provisional, questionable, riskful, risky, shaky, shifting, shifty, slippery, speculative, temporary, tentative, ticklish, treacherous, tricky, uncertain, undependable, unfaithworthy, unhealthy, unpredictable, unreliable, unsafe, unsolid, unsound, unstable, unsteadfast, unsteady, unsubstantial, unsure, untrustworthy, venturesome, venturous, wicked, wildcat