wacko

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wack·o

 (wăk′ō) also whack·o (wăk′ō, hwăk′ō)Slang
n. pl. wack·os
A person regarded as eccentric or irrational: "a catchy pop portrait of a wacko who talks to himself in French" (Phoebe Hoban).
adj.
Wacky.

[Alteration of wacky.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

wacko

(ˈwækəʊ)
adj
mad or eccentric
n, pl wackos
a mad or eccentric person
[C20: back formation from wacky]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

wack•o

(ˈwæk oʊ)

n., pl. wack•os,
adj. Slang. n.
1. Also, wack. an eccentric person.
adj.
2. wacky.
[1970–75, Amer.]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.wacko - a person who is regarded as eccentric or madwacko - a person who is regarded as eccentric or mad
eccentric, eccentric person, oddball, flake, geek - a person with an unusual or odd personality
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
Translations

wacko

[ˈwækəʊ] ADJcolgado, excéntrico
Collins Spanish Dictionary - Complete and Unabridged 8th Edition 2005 © William Collins Sons & Co. Ltd. 1971, 1988 © HarperCollins Publishers 1992, 1993, 1996, 1997, 2000, 2003, 2005

wacko

[ˈwækəʊ] adj (= crazy) → dingo
Collins English/French Electronic Resource. © HarperCollins Publishers 2005

wacko

adj (inf)durchgedreht (inf)
Collins German Dictionary – Complete and Unabridged 7th Edition 2005. © William Collins Sons & Co. Ltd. 1980 © HarperCollins Publishers 1991, 1997, 1999, 2004, 2005, 2007
References in periodicals archive ?
Performers should beef up their security, access to weapons should be restricted, and potentially dangerous wackos should be pinpointed before they act on their worst impulses.
when we're dependent on Iranian mullahs and wackos in Venezuela."
In an e-mail to a lawyer, Scanlon explained it this way: "Simply put we want to bring out the wackos to vote against something and make sure the rest of the public lets the whole thing slip past them.
The script stated that the fictitious terrorists were a group of home-schooling radicals labeled "Wackos Against Schools and Education" who believed everyone should be home schooled.
Considering his anti-immigration policies, he shouldn't be calling these nazis wackos as they are the only votes he will get.