wacky

[wak-ee]
adjective, wackier, wackiest. Slang.
odd or irrational; crazy: They had some wacky plan for selling more books.
Also, whacky.


Origin:
1935–40; apparently whack (noun, as in out of whack) + -y1

wackily, adverb
wackiness, noun
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
wacky (ˈwækɪ)
 
adj , wackier, wackiest
slang eccentric, erratic, or unpredictable
 
[C19 (in dialect sense: a fool, an eccentric): from whack (hence, a whacky, a person who behaves as if he had been whacked on the head)]
 
'wackily
 
adv
 
'wackiness
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

wacky
"crazy, eccentric," 1935, variant of whacky (n.) "fool," late 1800s British slang, probably ultimately from whack "a blow, stroke," from the notion of being whacked on the head one too many times. Wack "crazy person" is a 1938 back-formation; extended form wacko is recorded from 1977. Wack in slang sense
of "worthless, stupid," is attested from late 1990s.
Online Etymology Dictionary, © 2010 Douglas Harper
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Slang Dictionary

wacky definition


  1. mod.
    loony; silly and giddy. : You are about the wackiest guy I ever met.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition.
Copyright 2007. Published by McGraw-Hill Education.
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Example sentences
It was a wonderful, wacky, crazy-quilt dream as long as as it lasted.
Because of this media failure, wacky alternative theories about the cause of
  climate change are on the increase.
That's where you learn all those wacky ideas about evolution.
No conspiracy theories, no wacky illogical prejudices, nothing.
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