Synonyms for Daft:

adj.

deranged (adjective)
nutty.
foolish (adjective)
lunatic, loopy.
gaga (adjective)
around the bend.
insane (adjective)
crackers, deranged, demented, moonstruck, bananas, brainsick, fruity, loco, balmy.
screwy (adjective)
screwy.
senseless (adjective)
asinine.
stupid; crazy (adjective)
crackers, asinine, screwy, unsound, foolish, bonkers, lunatic, wacky, touched, nutty, unbalanced, ridiculous, Daffy, nuts, mad, deranged, insane, demented, cracked.
touched (adjective)
not all there.

n.

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

Other synonyms:

brainsick, bananas, mentally ill, Daffy. screwy, touched, non compos mentis, unbalanced, demented, maniacal, distraught. disordered, moonstruck, unsound. mad. off. Other relevant words:
childish, bananas, cuckoo, screwy, over-the-top, mentally ill, disordered, maniacal, moonstruck, deranged, maniac, foolish, unsound, mad, brainsick, touched, Daffy, mad as a hatter, asinine, sane, of unsound mind, nutty as a fruitcake, crazy as a loon, lunatic, non compos mentis, laughable, unbalanced, sick in the head, distraught, ridiculous, demented, ludicrous, off, not all there, stark raving mad.

Usage examples for daft

  1. They were enraged, however, to think these politicians could imagine them so dead daft – The Honest American Voter's Little Catechism for 1880 by Blythe Harding
  2. In that hour I thought her as daft as the Sweet- Singers, whose nails were uncommonly near my cheek. – Salute to Adventurers by John Buchan