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loony or
looney
also
luny
adjective
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Informal. So senseless as to be laughable: absurd, foolish, harebrained, idiotic, imbecilic, insane, lunatic, mad, moronic, nonsensical, preposterous, silly, softheaded, tomfool, unearthly, zany.
Informal: cockeyed, crazy, loopy.
Slang: balmy
2, dippy, dopey, jerky, sappy, wacky. See
ability, knowledge
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Informal. Afflicted with or exhibiting irrationality and mental unsoundness: brainsick, crazy, daft, demented, disordered, distraught, dotty, insane, lunatic, mad, maniac, maniacal, mentally ill, moonstruck, off, touched, unbalanced, unsound, wrong.
Informal: bonkers, cracked, daffy, gaga.
Slang: bananas, batty, buggy, cuckoo, fruity, loco, nuts, nutty, screwy, wacky.
Chiefly British: crackers.
Law: non compos mentis.
Idioms:
around the bend, crazy as a loon, mad as a hatter, not all there, nutty as a fruitcake, off (or out of) one's head, off one's rocker, of unsound mind, out of one's mind, sick in the head, stark raving mad. See
sane
noun
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Informal. A person regarded as strange, eccentric, or crazy: crackpot, crazy, eccentric, lunatic.
Informal: crank, loon.
Slang: cuckoo, ding-a-ling, dingbat, kook, nut, screwball, weirdie, weirdo. See
wise
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