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

1. Informal or slang term meaning insane, strange, eccentric or stupid
   - 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, daffy, dippy, nutsy [N. Amer], potty [Brit], daft as a brush [Brit], round the twist [Brit], cuckoo

Derived forms: wackos, wackoes

See also: insane

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

Encyclopedia: Wacko