agnostic ambiguous awkward blankminded borderline callow capricious chancy changeable dangerous desultory dicey dickey doubtful doubting dubious dumb empty empty-headed equivocal erratic fickle fluctuant fly-by-night gauche green groping hazardous hesitant hesitating ignorant inane incalculable indecisive indemonstrable inexperienced infirm innocent insecure insubstantial irresolute irresponsible know-nothing naive nescient open perilous polysemous precarious problematic provisional questionable raw risky rocky rootless shaky shifting shifty simple skeptical slippery strange to suspicious temporary tentative ticklish tottery touch-and-go treacherous trustless unaccountable unacquainted unapprized unassured uncertain unclear uncomprehending unconfident unconfirmable unconversant unconvinced undecided undependable undivinable unenlightened unfaithworthy unfamiliar unforeseeable unhealthy unilluminated uninformed uninitiated unintelligent unknowing unpersuaded unposted unpredictable unprovable unreliable unripe unsafe unselfassured unselfconfident unselfreliant unsolid unsound unstable unsteadfast unsteady unsubstantial untrustworthy untrusty unverifiable unversed vacillating vacuous variable wavering weak whimsical wobbly