WordWeb Online

1. Having the flavour of nuts
   "a nutty sherry"
   - nutlike
    
2. Informal or slang term for mentally irregular
   "it used to drive my husband nutty"
   - balmy [archaic], barmy, bats, batty, bonkers, buggy [N. Amer], cracked, crackers, daft, dotty, fruity, haywire, kooky, kookie, loco, loony, loopy, nuts, round the bend, around the bend, wacky, whacky, daft as a brush [Brit], wacko, round the twist [Brit]
    
3. Foolish; totally unsound
   - crazy, half-baked, screwball, softheaded, crackpot

Derived forms: nuttier, nuttiest

See also: impractical, insane, nut, tasty

Encyclopedia: Nutty