[ wak-ee ]
/ ˈwæk i /
adjective, wack·i·er, wack·i·est. Slang.
odd or irrational; crazy: They had some wacky plan for selling more books.
Wacky Regionalisms: Different Word, Same MeaningRead more in this article about some frequently asked questions and fun facts related to our definitions.
Related formswack·i·ly, adverbwack·i·ness, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for wackiness
/ (ˈwækɪ) /
adjective wackier or wackiest
slang eccentric, erratic, or unpredictable
Derived Formswackily, adverbwackiness, noun
Word Origin for wacky
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)
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 wackiness
"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.
Online Etymology Dictionary, © 2010 Douglas Harper