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Definition of loony:

  1. See Luny.


buggy, sappy, barmy, fruity, zany, soft, nutty, nuts, wild, around the bend, lunatic, chapped, dippy, off, crazy, awry, nutlike, brainsick, round the bend, insane, bonkers, zesty, amiss, whacky, zestful, demented, crank, touched, unearthly, screwy, harebrained, silly, wrong, alligatored, ability, mentally ill, batty, haywire, crackers, distraught, sane, nutcase, mild, kookie, dotty, cockamamie, knowledge, wise, roughened, screwball, gaga, daft, daffy, eccentric, nut, ding-a-ling, maniacal, looney, kook, bats, balmy, weirdo, non compos mentis, tomfool, loon, kooky, cuckoo, creep, preposterous, loco, cockeyed, weirdy, mad, softheaded, spook, moonstruck, dingbat, yeasty, unsound, cracked, unbalanced, loopy, weirdie, disordered, jerky, wacky, maniac, cockamamy, bananas.

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