Definition of wacky in US English:

wacky

(also whacky)

adjective

informal
  • Funny or amusing in a slightly odd or peculiar way.

    ‘a wacky chase movie’
    • ‘I think those whacky movies were more effective than dry lectures about the dangers of unsafe sex and drug use.’
    • ‘The room itself takes on the artist's intentions, being transformed into a slightly wacky domestic parlour.’
    • ‘Youngsters in Malmesbury and Sherston recycled old clothes to make weird and wacky costumes for a fashion show last Thursday.’
    • ‘Those whacky gardening folk and their uproarious naming schemes!’
    • ‘People completed the course dressed in all kinds of weird and wacky outfits this year.’
    • ‘Sure she came across as a bit wacky, and a bit all over the place at times.’
    • ‘After 170 years of wacky inventions and strange new models, it seems we may finally be at the end of the road for the electric car.’
    • ‘His wacky antics and funny walk endeared him to children of all ages.’
    • ‘Dixon leapt to fame in the 1980s with his wacky welded furniture made of bits of scrap metal.’
    • ‘I have read some whacky things in my time but the latest report of the Electoral Reform Society takes some beating.’
    • ‘Dottie is a Lucille Ball clone who performs wacky antics on her television show.’
    • ‘The children came up with some weird and wacky designs including a pink and purple dinosaur covered in sequins.’
    • ‘Thank you, all you wacky people, for your interesting suggestions for new car names.’
    • ‘Those wacky creative types at the ad agency will believe it ‘hits all the right buttons’.’
    • ‘The cast of whacky eccentrics and their unbelievable behaviour grates; it doesn't come across as in any way real.’
    • ‘Thousands of people up and down the country are doing weird and wacky things today to raise money for Comic Relief.’
    • ‘You may even be able to squeeze out a few more wacky anecdotes from that slightly dysfunctional family of yours.’
    • ‘Teachers and students were asked to make a gold coin donation in order to sport their weird and wacky hairstyles for the day.’
    • ‘There's a flood of whacky stories, and it's difficult to tell what's real and what's not.’
    • ‘The Renaissance repertoire ranges from the whacky to the sublime, and it's possible that we gave some pieces their first Scottish performances in hundreds of years.’
    zany, madcap, offbeat, quirky, outlandish, eccentric, idiosyncratic, surreal, ridiculous, nonsensical, crazy, absurd, insane, far out, fantastic, bizarre, peculiar, weird, odd, strange, cranky, freakish
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Origin

Mid 19th century (originally dialect): from the noun whack + -y.

Pronunciation

wacky

/ˈwæki//ˈwakē/