1. (adj) crazy, loony, looney, nutcase, weirdo
someone deranged and possibly dangerous
Synonyms: spook, nutcase, creep, weirdo, crazy, weirdie, loony, weirdy, looney
Antonyms: sane
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
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Synonyms for loony 
