Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Extremely foolish or silly.
  • adj. Crazy; insane.
  • n. A foolish or crazy person.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. insane
  • adj. very silly, absurd
  • n. An insane or very foolish person

from the GNU version of the Collaborative International Dictionary of English

  • adj. Crazy; insane; lunatic; mentally unsound.
  • adj. Very foolish; very impractical.
  • n. someone mentally deranged and possibly dangerous.

from The Century Dictionary and Cyclopedia

  • n. See luny.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. someone deranged and possibly dangerous
  • adj. informal or slang terms for mentally irregular

Etymologies

Shortening and alteration of lunatic, or from loon2.
(American Heritage® Dictionary of the English Language, Fourth Edition)
Shortened from lunatic (Wiktionary)

Examples

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