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Noun: looney  loo-nee
Usage: informal
  1. An insane person
    "Jack the Ripper was probably a looney";
    - lunatic, maniac, crazy [N. Amer, informal], loony [informal], nutcase [informal], headcase [informal]

Derived forms: looneys

Type of: diseased person, sick person, sufferer

Encyclopedia: Looney, Martin