1. (of an idea or plan etc) Absurd, foolish or stupid.
    • 2008, Sarah McCarty, Promises Reveal, Penguin (ISBN 9781440634376)
      “Now why do I get the feeling we're not talking about the harebrained plan you came up with?” “It wasn't harebrained.” “Did it have you going within twenty feet of a whorehouse at night, unchaperoned?” He knew darn well it did.
  2. (of a person) Frivolous and silly; featherbrained or scatterbrained.

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