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Adjective: daft as a brush
Usage: Brit
  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, wacko, round the twist [Brit]

See also: insane