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loony - 6 dictionary results
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loon⋅y

1  [loo-nee] adjective, loon⋅i⋅er, loon⋅i⋅est, noun, plural loon⋅ies. Informal.
Use loony in a Sentence
–adjective
1. lunatic; insane.
2. extremely or senselessly foolish.
–noun
3. a lunatic.
Also, looney, luny.

Origin:
1860–65; lun(atic) + -y 2

Related forms:
loon⋅i⋅ness, noun

loon⋅y

2  [loo-nee]
–noun, plural loon⋅ies.
loonie.

loon⋅ie

  [loo-nee]
–noun
Canadian Informal. a dollar coin.
Also, loony.

Origin:
from the image of a loon on the reverse
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
Cite This Source Link To loony
loon·y or loon·ey also lun·y   (lōō'nē)   
adj.   loon·i·er also lun·i·er, loon·i·est also lun·i·est
  1. Extremely foolish or silly.
  2. Crazy; insane.
n.   pl. loon·ies also loon·eys or lun·ies
A foolish or crazy person.

[Shortening and alteration of lunatic, or from loon2.]
loon'i·ly adv., loon'i·ness n.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Loony

Loon"y\, a. See Luny.
Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc.
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loony 
1853, Amer.Eng., short for lunatic, but also infl. by loon (2), which is noted for its wild cry and method of escaping from danger. Slang loony bin "insane asylum" is from 1919. Looney left in ref. to holders of political views felt to be extreme is from 1977.
Online Etymology Dictionary, © 2001 Douglas Harper
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