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Definition of loony

loony

/ˈluː.ni/
loo · ny
Plural:loonies
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loony Lexical Profile

loony Game Scores & Validity

• adjective

1

Crazy, foolish, or wildly eccentric.

Example

"They came up with a loony scheme to cross the desert on unicycles."

Synonyms
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Antonyms
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• noun

1

A foolish, eccentric, or mentally unstable person.

Example

"Only a complete loony would go swimming in the icy river in the middle of January."

Synonyms
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Antonyms
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Word Nuance & Usage

Also spelled 'looney', this word should not be confused with the homophone 'loonie', which specifically denotes the Canadian one-dollar coin bearing the image of a common loon.

• Rhymes for loony

• Nearby Words

loon
loonie
looniness
loony
loop
looped
looper

Word Origin & Etymology

Coined in the late 19th century as a colloquial shortening of 'lunatic' with the addition of the suffix '-y', ultimately tracing back to Latin 'lunaticus' ('moonstruck').

Cite this Entry

Wordmom. (2026). Definition of Loony. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/loony
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