WordWeb Online

1. A person who is regarded as eccentric or mad
   - nutter [Brit], whacko, nutbar [N. Amer], basket case, nutcake [US], nutjob, mentalist [Brit], whackjob [N. Amer]

1. Informal or slang term for mentally irregular
   - balmy [archaic], barmy, bats, batty, bonkers, buggy [N. Amer], cracked, crackers, daft, 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]

Derived forms: wackoes, wackos

See also: insane

Type of: dag [Austral, NZ], eccentric, eccentric person, flake, geek, oddball

Encyclopedia: Wacko