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Definition of nutty : 1. Abounding in nuts.
2. Having a flavor like that of nuts; as, nutty wine.

Synonyms:

zany, balmy, kookie, mild, nutty as a fruitcake, wacky, loopy, bananas, daft, chapped, cracked, silly, screwy, gaga, buggy, alligatored, loony, round the bend, off, fruity, crackers, cuckoo, amiss, wrong, moonstruck, bats, around the bend, touched, brainsick, soft, sick in the head, sappy, loco, zestful, non compos mentis, disordered, mentally ill, cockamamy, goofy, roughened, sane, whacky, crazy as a loon, nutlike, mad as a hatter, cockamamie, maniac, not all there, unsound, tasteful, barmy, zesty, nuts, haywire, stark raving mad, awry, distraught, yeasty, daffy, dotty, bonkers, of unsound mind, wild

eccentric

crackpot, fiendish

demented, mad, irrational, feverish, babbling, kooky, hysterical, deranged, crack-brained, brain-sick, psychotic, neurotic, lunatic, unbalanced, berserk, crazy, frenzied, delirious, maniacal, schizoid, psycho, blithering, batty, insane

Usage examples:

• We got so busy followin' the nutty scheme of this conversation expert who plots to pass off a flower- girl for a Duchess that the next wait is well under way before I remembers the gent in the box. - "Torchy, Private Sec.", Sewell Ford.
• It struck me at the time as a nutty thing to do, but of course I'm no judge. - "Wilt Thou Torchy", Sewell Ford.
• When they see her they jest nacherally goes nutty. - "The Untamed", Max Brand.