apish arrested asinine babbling backward batty befooled beguiled besotted blithering brainless buffoonish burbling cockeyed crackbrained cracked crazy credulous cretinistic cretinous daffy daft dazed dim-witted dithering dizzy doting driveling drooling dull dumb fatuitous fatuous feebleminded flaky fond fool foolheaded foolish fuddled futile gaga goofy gulled half-baked half-witted idiotic imbecile imbecilic inane inept infatuated insane kooky loony mad maudlin maundering mentally defective mentally deficient mentally handicapped mentally retarded mongoloid not all there nutty retarded sappy screwy senseless sentimental silly simple simpleminded simpletonian slobbering slow-witted stupid subnormal thoughtless wacky wet witless