Synonyms and related words :
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