Source : Webster's Revised Unabridged Dictionary (1913)

Daft \Daft\ (d[.a]ft), a. [OE. daft, deft, deft, stupid; prob.
   the same word as E. deft. See {Deft}.]
   1. Stupid; foolish; idiotic; also, delirious; insane; as, he
      has gone daft.

            Let us think no more of this daft business --Sir W.
                                                  Scott.

   2. Gay; playful; frolicsome. [Scot.] --Jamieson.

Source : WordNet®

daft
     adj : informal or slang terms for mentally irregular; "it used to
           drive my husband balmy" [syn: {balmy}, {barmy}, {bats},
            {batty}, {bonkers}, {buggy}, {cracked}, {crackers}, {dotty},
            {fruity}, {haywire}, {kooky}, {kookie}, {loco}, {loony},
            {loopy}, {nuts}, {nutty}, {round the bend}, {around
           the bend}, {wacky}, {whacky}]