Synonyms for Nutty:

adj.

absurd (adjective)
laughable, ludicrous.
brainsick (adjective)
sick in the head, stark raving mad.
crackers (adjective)
crazy as a loon.
deranged (adjective)
batty, buggy, cracked, crazy, daft, demented, eccentric, insane, irrational, kooky, loony, lunatic, mad, nuts, ridiculous, touched, wacky, Daffy.
flaky (adjective)
haywire.
foolish (adjective)
loopy.
insane (adjective)
babbling, batty, berserk, blithering, crazy, delirious, demented, deranged, feverish, frenzied, hysterical, insane, irrational, kooky, lunatic, mad, maniacal, neurotic, psycho, psychotic, schizoid, unbalanced, Crack-brained, brain-sick, balmy, brainsick, crackers, fruity, loco, moonstruck.
loco (adjective)
around the bend.
lunatic (adjective)
Fiendish, crackpot, crazy, kooky, lunatic, mad, neurotic, psychotic, schizoid.
screwy (adjective)
screwy.
touched (adjective)
not all there.

n.

childish, laughable, ludicrous, over-the-top, ridiculous, not in your right mind/not right in the head. brainsick, buttery, calorific, chewy, chilled, cool, cream, crisp, crispy, cuckoo, disordered, distraught, maniac, mentally ill, moonstruck, non compos mentis, of unsound mind, off, sane, screwy, touched, unsound, Daffy, bananas, caramelized, not all there, crazy as a loon, mad as a hatter, nutty as a fruitcake, sick in the head, stark raving mad. nutty (noun)
around the bend, balmy, barmy, bats, batty, bonkers, buggy, cracked, crackers, daft, dotty, fruity, haywire, insane, kookie, kooky, loco, loony, loopy, nutlike, nuts, round the bend, tasteful, wacky, whacky.

v.

deranged (verb)
eccentric.

Other synonyms:

brainsick, mentally ill, Daffy, bananas. distraught, non compos mentis, screwy, touched. disordered, moonstruck, unsound. off. Other relevant words:
around the bend, balmy, barmy, bats, bonkers, brainsick, buggy, buttery, calorific, chewy, childish, chilled, cool, cracked, crackers, cream, crisp, crispy, cuckoo, daft, disordered, distraught, dotty, eccentric, fruity, haywire, kookie, laughable, loco, loony, loopy, ludicrous, maniac, mentally ill, moonstruck, non compos mentis, nutlike, nuts, of unsound mind, off, over-the-top, ridiculous, round the bend, screwy, tasteful, touched, unsound, wacky, whacky, Daffy, bananas, caramelized, not all there, crazy as a loon, mad as a hatter, nutty as a fruitcake, sick in the head, stark raving mad.

Usage examples for nutty

  1. " I am going nutty muttered Sinclair. – The Rangeland Avenger by Max Brand
  2. So, if you must know, every third Wednesday Aunt Nutty goes through the motions of pullin' off a pink tea. – Wilt Thou Torchy by Sewell Ford
  3. But this death- fancier's the real squeeze- only raises the graveyard in private an' don't take any money, an' a whole lot of big doctors an' psychology profs are nutty about her, you see? – The Professor's Mystery by Wells Hastings Brian Hooker