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