ambiguous, chancy, choppy, dicey, doubtful, dubious, erratic, foggy, groggy, iffy, indecisive, insecure, nonplussed, nonsolid, parlous, precarious, questionable, scabrous, shaky, slick, slimy, slippery, tentative, tottery, uncertain,
unreliable, unsafe, unsettled, unsteady, unsure, untrustworthy, vague