adjective Uncommon

wacky

WAK-ee

Wacky (adjective) means Amusingly odd, silly, or eccentric. Example: “The kids came up with a wacky plan to build a treehouse fort.”

adjective

Amusingly odd, silly, or eccentric.

"The kids came up with a wacky plan to build a treehouse fort."

"She has a wacky sense of humour that always makes meetings more fun."

How to use wacky

Learner’s notes

In plain EnglishFun, silly, or a little crazy in a harmless way.

Common pairings

wacky idea wacky humour wacky races

wackier comparative, wackiest superlative

Study it as flashcards or scroll it in Flow — saved to your collection.

Test yourself on “wacky” A quick quiz — meaning, synonyms & usage →

Can you complete this real example?

The kids came up with a _____ plan to build a treehouse fort.

From "whack" — originally describing someone who'd taken one too many knocks to the head, hence "odd" — plus the adjective-forming suffix "-y".

Jacky tacky hacky blacky

What does “wacky” mean?

The word “wacky” means amusingly odd, silly, or eccentric. In plain terms, fun, silly, or a little crazy in a harmless way.

How do you pronounce “wacky”?

“Wacky” is pronounced WAK-ee (/ˈwæk.iː/ in IPA).

How do you use “wacky” in a sentence?

Here is “wacky” used in a sentence: “The kids came up with a wacky plan to build a treehouse fort.”

What part of speech is “wacky”?

“Wacky” is an adjective.

Is “wacky” a common word?

“Wacky” is an uncommon word in modern English.