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Adjective: scatty (scattier,scattiest)  ska-tee
Usage: Brit, informal
  1. Lacking sense or discretion
    "his scatty crackpot ideas";
    - rattlebrained, rattlepated, scatterbrained
  2. Lost in thought; showing preoccupation
    "the scatty glancing quality of a hyperactive but unfocused intelligence";
    - absent, absentminded, abstracted

Derived forms: scattier, scattiest

See also: daft [Brit, informal], dumb, foolish, imbecile, imbecilic, inattentive, stupid, unattentive [rare]