Wacko

//ˈwæ.koʊ// adj, intj, noun, slang

adj, intj, noun, slang ·Common ·High school level

Definitions

Noun
  1. 1
    An amusingly eccentric or irrational person. derogatory, slang

    "“Environmentalist wackos” — Mr. Limbaugh’s phrase — “want man to be responsible for it because they want to control your behavior,” the conservative host said on the show."

  2. 2
    a person who is regarded as eccentric or mad wordnet
Adjective
  1. 1
    Amusingly eccentric or irrational. derogatory, informal, slang
Intj
  1. 1
    Hurrah! British, dated

    ""Wacko! There's a whole pile of letters for me," Jennings cried excitedly, hopping from one foot to the other."

Synonyms

All synonyms
nutter'ave itaahaberrantabnormalalright

Example

More examples

"When I say Yanni is a wacko, that's what I mean."

Etymology

From wack(y) + -o.

More for "wacko"

SynonymsSentencesPronunciationTranslate

Next best steps

Find stronger synonymsSee usage examplesCheck pronunciationBrowse writing guides

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.