wacko

adjectivenouninterjectionattested in dialogue

United Kingdom//ˈwæ.kəʊ//
United States//ˈwæ.koʊ//

Amusingly eccentric or irrational.

adjective

1
informalAmusingly eccentric or irrational.

Etymology

Etymology tree English whack Proto-Indo-European *-kos Proto-Germanic *-gaz Proto-West Germanic *-g Old English -iġ Middle English -y English -y English wack(y) Latin ō Old French ohbor. Middle English o English O ▲ Middle English o English oh English -o English wacko From wack(y) + -o.

noun

1
slangAn amusingly eccentric or irrational person.
“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.

interjection

1
datedHurrah!
"Wacko! There's a whole pile of letters for me," Jennings cried excitedly, hopping from one foot to the other.

Forms

plural: wackos, wackoes
comparative: more wacko
superlative: most wacko

W. · Wednesday.wa · A traditional proa-style outrigger canoe of the Caroline…Wa · An ethnic group in Myanmar and China.

wacko · Amusingly eccentric or irrational.

wacky · Zany; eccentric.wad · An amorphous, compact mass.wade · To walk through water or something that impedes progress.

The neighbouring pages — Alphabetical order follows the rules of the language, not byte values: an accent decides only between two otherwise identical words, and Spanish files Ñ as a letter of its own.