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looney

[loo-nee]
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adjective, loon·i·er, loon·i·est, noun, plural loon·eys, loon·ies.
  1. loony1.
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loony1

or loon·ey, lun·y

[loo-nee]Informal.
adjective, loon·i·er, loon·i·est.
  1. lunatic; insane.
  2. extremely or senselessly foolish.
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noun, plural loon·ies.
  1. a lunatic.
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Origin of loony1

First recorded in 1860–65; lun(atic) + -y2
Related formsloon·i·ness, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for looney

loony

looney or luny

slang
adjective loonier, looniest, lunier or luniest
  1. lunatic; insane
  2. foolish or ridiculous
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noun plural loonies, looneys or lunies
  1. a foolish or insane person
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Derived Formslooniness or luniness, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for looney

loony

adj.

also loonie, looney, 1853, American English, short for lunatic, but also influenced by loon (n.2) and perhaps loon (n.1), the bird being noted for its wild cry and method of escaping from danger. As a noun by 1884, from the adjective. Slang loony bin "insane asylum" is from 1919. Looney left in reference to holders of political views felt to be left-wing in the extreme is from 1977. Looney Tunes, Warner Bros. studios' animated cartoon series, dates from 1930.

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Online Etymology Dictionary, © 2010 Douglas Harper