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doltish, jackass, crackpot, moronic, dotty, meat-headed, dumb, bone-headed, asinine, ignorant, idiotic, half-witted, stupid, absurd, brainless, blithering, blockheaded, goofy, foolish, imbecilic, nitwit, chuckle-headed, dopey, cretinous, dim-witted, lame-brained, inane, nonsensical, crazy, knuckle-headed.
bananas, deranged, batty, non compos mentis, round the bend, daffy, wild, looney, harebrained, madman, sappy, crackbrained, chapped, ridiculous, wacky, fruity, bedlam, loony tunes, creep, eccentric, crazed, jerky, roughened, laughable, crackers, crank, nutty, bats, demented, bonkers, lunkheaded, lunatic, certifiable, mad, headcase, zestful, unsound, childish, loon, nuts, kookie, kook, sane, bubbleheaded, gaga, screwball, space cadet, preposterous, madwoman, distraught, kooky, insane, scatty, nutlike, weirdo, nutjob, buggy, wise, oddity, meshuga, dingbat, cockamamie, cuckoo, zesty, inept, fool, over-the-top, dippy, screwy, haywire, bughouse, whacky, wacko, yeasty, cranky, awry, unbalanced, silly, mentally ill, cracked, featherheaded, off, ding-a-ling, senseless, unwise, witless, loopy, dotty, nutcase, oddball, knowledge, psycho, wrong, tomfool, soft, psychotic, cockamamy, balmy, barmy, disordered, amiss, weirdy, maniacal, weirdie, weak-minded, brainsick, ability, nut, spook, unhinged, around the bend, moonstruck, wud, ludicrous, softheaded, simpleminded, mild, crazy, fatuous, zany, maniac, half-baked, touched, daft, alligatored, cockeyed, mental, loco, unearthly, not in your right mind/not right in the head.
I believe you're goin' loony. - "Cy Whittaker's Place", Joseph C. Lincoln.
good looks, screw-loose, break loose, let loose, loose off, loose woman, loose-fitting, loose-jointed, loose-jowled, on the loose.