wacko

wack·o

W0002000 (wăk′ō) also whack·o (wăk′ō, hwăk′ō)Slang n. pl. wack·os A person regarded as eccentric or irrational: "a catchy pop portrait of a wacko who talks to himself in French" (Phoebe Hoban).adj. Wacky.

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[Alteration of wacky.]

wacko

(ˈwækəʊ) adjmad or eccentricn, pl wackosa mad or eccentric person[C20: back formation from wacky]

wack•o

(ˈwæk oʊ)

n., pl. wack•os,
adj. Slang. n. 1. Also, wack. an eccentric person. adj. 2. wacky. [1970–75, Amer.]

Thesaurus

Noun

1.

wacko - a person who is regarded as eccentric or madnutter, whackoeccentric, eccentric person, oddball, flake, geek - a person with an unusual or odd personality

Translations