Synonyms and related words :
awkward, blankminded, callow, dumb, empty, empty-headed, gauche, green, groping, ignorant, inane, incognizant, inexpectant, inexperienced, innocent, know-nothing, naive, nescient, nonexpectant, oblivious, raw, simple, strange to, tentative, unacquainted, unadmonished, unadvised, unanticipating, unanticipative, unapprized, unaware, uncomprehending, unconversant, unenlightened, unexpecting, unfamiliar, unforewarned, unguessing, unilluminated, uninitiated, uninstructed, unintelligent, unknowing, unposted, unprepared, unready, unripe, unsure, unsuspecting, unversed, unwarned, unwitting, vacuous