1. (adj) cockamamie, cockamamy, goofy, sappy, silly, wacky, whacky, zany
ludicrous, foolish
Synonyms: slaphappy, crackers, light-headed, ridiculous, round the bend, lightheaded, nutty, punch-drunk, dotty, featherbrained, sappy, kooky, daft, bats, empty-headed, clownish, airheaded, fruity, nuts, bonkers, clownlike, cracked, haywire, wacky, loco, kookie, buggy, zany, silly, goofy, pathetic, dizzy, batty, cockamamy, loony, barmy, cockamamie, buffoonish, around the bend, balmy, giddy, loopy, whacky
Antonyms: sane, wise
2. (adj) balmy, barmy, bats, batty, bonkers, buggy, cracked, crackers, daft, dotty, fruity, haywire, kooky, kookie, loco, loony, loopy, nuts, nutty, round the bend, around the bend, wacky, whacky
informal or slang terms for mentally irregular
Synonyms: crackers, nutlike, roughened, round the bend, bats, gaga, cockamamy, zesty, buggy, dotty, soft, wacky, kooky, daft, fruity, alligatored, zestful, kookie, nuts, sappy, bonkers, cracked, haywire, nutty, wrong(p), loco, wild, chapped, zany, silly, amiss(p), mild, awry(p), batty, crazy, loony, yeasty, barmy, cockamamie, goofy, around the bend, balmy, loopy, whacky
Antonyms: sane, wise
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Synonyms and Antonyms of whacky 
