Antonyms for wacky:
lucid, wise, intelligent, bright, workaday, standard, commonplace, ordinary, unexceptional, average, run-of-the-mill, sane, smart, prosaic, normal, unremarkable, regular, typical, serious, everyday, clever, brainy, common, balanced.
Synonyms for wacky:
Other synonyms and related words:
fatuous, pathetic, psychotic, quirky, slaphappy, witless, buffoonish, unwise, featherbrained, absurd, tomfool, clownish, lunatic, off-kilter, alligatored, non compos mentis, way out, idiotic, chapped, nonsensical, kinky, brainless, Daffy, bizarro, moronic, strange, touched, asinine, zestful, wrong, funny, bedlam, half-witted, wacko, inept, roughened, batty, gaga, lunkheaded, bughouse, unhinged, erratic, lightheaded, mild, moonstruck, ridiculous, wild, empty-headed, imbecilic, certifiable, light-headed, cockeyed, crazed, mental, bananas, maniacal, out-of-the-way, giddy, off, airheaded, weirdo, nutlike, remarkable, cranky, half-baked, brainsick, unbalanced, outlandish, cuckoo, dizzy, Queerish, featherheaded, unearthly, bizarre, mentally ill, unsound, zesty, weird, screwy, off-the-wall, psycho, odd, peculiar, dippy, crackpot, Weak-minded, simpleminded, distraught, demented, crazy, softheaded, harebrained, meshuga, WUD, jerky, preposterous, dopey, bubbleheaded, deranged, soft, illogical, mad, eccentric, disordered, spaced-out, screwball.
acting crazy (adjective)
Sense 1 (noun)
cockamamy, round the bend, loony, cracked, crackers, kookie, loopy, around the bend, balmy, bonkers, sappy, daft, haywire, goofy, silly, batty, whacky, buggy, fool, nuts, bats, insane, unreasonable, nutty, kooky, zany, fruity, barmy, cockamamie, foolish, loco, dotty.