wacky

Also whack·y

[wak-ee]

adjective

Slang.

wackier, wackiest 

1. odd or irrational; crazy.

   They had some wacky plan for selling more books.

wacky

/ ˈwækɪ /

adjective

1. slang,  eccentric, erratic, or unpredictable

Other Word Forms

• wackily adverb
• wackiness noun

Word History and Origins

Origin of wacky¹

First recorded in 1935–40; apparently whack (noun, as in out of whack ) + -y ¹

Word History and Origins

Origin of wacky¹

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)

Example Sentences

But the wacky challenge, which involves racing through 120 yards of peat bog trench, saw nearly 200 people take part at the annual World Bog Snorkelling Championships at Llanwrtyd Wells, Powys.

From BBC

Yet it seems I’ve yet to learn from my previous mistakes because now, as a grown adult, I still find myself drawn to the wackiest of wacky flavors.

From Salon

On a sunny day in San Francisco, along the city’s waterfront, families dived into the wacky world of artificial intelligence inside the Exploratorium museum.

From Los Angeles Times

Styling each other’s hair with lube in her hospital bed was kind of both wacky and lovely.

From Los Angeles Times

It was so stupid and wacky that it was wonderful.

From Los Angeles Times

Related Words

• absurd 
• crazy 
• eccentric 
• foolish 
• loony 
• nutty 
• odd 
• silly 
• unpredictable 
• whacky 
• zany