WordWeb Online

1. Informal or slang term meaning insane or very stupid
   "it used to drive my husband daft";
   - balmy [archaic], barmy, bats, batty, bonkers, buggy [N. Amer], cracked, crackers, dotty, fruity, haywire, kooky, kookie, loco, loony, loopy, nuts, nutty, round the bend, around the bend, wacky, whacky, daft as a brush [Brit], round the twist [Brit], wacko, cuckoo
    
2. Devoid of good sense or judgment
   - foolish, stupid, dumb

Derived forms: daftest, dafter

See also: absurd, asinine, cockamamie [N. Amer], cockamamy [N. Amer], cockeyed, derisory, fatuous, fond, goofy, harebrained, idiotic, ill-advised, ill-conceived, impolitic, imprudent, inadvisable, inane, insane, laughable, ludicrous, mad, mindless, misguided, nonsensical, preposterous, rattlebrained, rattlepated, ridiculous, sappy, scatterbrained, scatty [Brit], silly, unadvisable, unadvised, unwise, vacuous, wacky, whacky, zany

Encyclopedia: Daft