Dictionary.com
definitions
  • synonyms

wacky

[wak-ee]
See more synonyms for wacky on Thesaurus.com
adjective, wack·i·er, wack·i·est. Slang.
  1. odd or irrational; crazy: They had some wacky plan for selling more books.
Show More
Also whacky.

Origin of wacky

1935–40; apparently whack (noun, as in out of whack) + -y1
Related formswack·i·ly, adverbwack·i·ness, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for wacky

Contemporary Examples

Historical Examples

  • If Jerry started for the swamp at this time of night he must be wacky!

    Swamp Island

    Mildred A. Wirt

  • The two biggest one give the old man two wacky, one each, an' the little one wouldn' give any.


British Dictionary definitions for wacky

wacky

adjective wackier or wackiest
  1. slang eccentric, erratic, or unpredictable
Show More
Derived Formswackily, adverbwackiness, noun

Word Origin

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 wacky

adj.

"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.

Show More
Online Etymology Dictionary, © 2010 Douglas Harper