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See more synonyms for wacko on Thesaurus.com
noun, plural wack·os.
  1. Also wack. an eccentric, strange, or odd person.
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  1. wacky.
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Origin of wacko

1970–75, Americanism; see wacky, -o
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Related Words for wacko

screwball, crackpot, lunatic, nut, crazy, flake, dingbat, crank, weirdo, fruitcake, wacko, kook, oddball, maniac, fool, eccentric, madman, loony, madwoman, lamebrain

Examples from the Web for wacko

Contemporary Examples of wacko

British Dictionary definitions for wacko


  1. mad or eccentric
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noun plural wackos
  1. a mad or eccentric person
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Word Origin for wacko

C20: back formation from wacky
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 wacko


extended form of wack, recorded from 1977.

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Online Etymology Dictionary, © 2010 Douglas Harper