Synonyms and related words :
awkward, benighted, blank, blankminded, brainless, callow, calm, dizzy, dumb, empty, empty-minded, empty-pated, empty-skulled, fatuous, featherbrained, featherheaded, flighty, fluttery, frivolous, gaga, gauche, giddy, giddy-brained, giddy-headed, giddy-pated, giddy-witted, green, groping, harebrain, harebrained, hollow, ignorant, illiterate, inane, incogitant, inexperienced, innocent, jejune, know-nothing, naive, nescient, nirvanic, oblivious, passive, quietistic, rattlebrained, rattleheaded, rattlepated, raw, relaxed, rude, scatterbrained, scramblebrained, shatterbrained, silly, simple, skittish, strange to, tentative, thoughtfree, thoughtless, tranquil, unacquainted, unapprized, uncomprehending, unconversant, uneducated, unenlightened, unfamiliar, unideaed, unilluminated, uninformed, uninitiated, uninstructed, unintellectual, unintelligent, unknowing, unlettered, unoccupied, unposted, unreasoning, unripe, unschooled, unsure, untaught, unthinking, unversed, vacant, vacuous, vapid, witless