Synonyms and related words :
ape about, apish, asinine, balmy, bananas, barmy, bats, batty, beany, befooled, beguiled, besotted, bonkers, brainless, buffoonish, buggy, bughouse, bugs, bugs on, cockeyed, cracked on, crackers, crazy, crazy about, credulous, cuckoo, daffy, daft, dazed, dippy, dizzy, doting, dotty, dumb, empty-headed, fatuitous, fatuous, featherbrained, featherheaded, flaky, flipped, fluttery, fond, fool, foolheaded, foolish, freaked-out, frivolous, fruitcakey, fruity, fuddled, futile, gaga over, giddy, giddy-brained, giddy-headed, giddy-pated, giddy-witted, gone on, goofy, gulled, harebrain, harebrained, haywire, hepped up over, hipped on, hot about, idiotic, imbecile, inane, inept, infatuated, insane, just plain nuts, kooky, loony, loopy, mad, mad about, maudlin, moronic, nuts, nuts about, nuts on, nutty, off the hinges, off the track, off the wall, potty, rattlebrained, rattleheaded, rattlepated, round the bend, sappy, scatterbrained, scramblebrained, screwball, screwballs, screwy, senseless, sentimental, shatterbrained, silly, slaphappy, starry-eyed over, steamed up about, stupid, thoughtless, turned-on, wacky, wet, wild about, witless