wacko

UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/ˈwækəʊ/US:USA pronunciation: respellingUSA pronunciation: respelling(wak′ō)

Inflections of 'wacko' (n): npl: wackos

WordReference Random House Unabridged Dictionary of American English © 2025
wack•o  (wak′ō),USA pronunciation n., pl. wack•os, adj. [Slang.]
n. 
  1. Also, wack. an eccentric, strange, or odd person.

adj. 
  1. wacky.
  • see wacky, -o 1970–75, American.

Collins Concise English Dictionary © HarperCollins Publishers::
wacko / ˈwækəʊ/
  1. eccentric
  2. insane
 (wackos)
  1. an eccentric or foolish person
  2. a person with a mental illness
Etymology: 20th Century: back formation from wacky
'wacko' also found in these entries (note: many are not synonyms or translations):
wack - whacko

Forum discussions with the word(s) "wacko" in the title:


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