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Synonyms

loony

1 American  
[loo-nee] / ˈlu ni /

noun

PLURAL

loonies

  1. loonie.

loony 2 American  
[loo-nee] / ˈlu ni /
Sometimes luny or looney

adjective

loonier, looniest

  1. lunatic; insane.

  2. extremely or senselessly foolish.

noun

PLURAL

loonies

  1. a lunatic.

loony British  
/ ˈluːnɪ /

adjective

  1. lunatic; insane

  2. foolish or ridiculous

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

noun

  1. a foolish or insane person

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Other Word Forms

  • looniness noun

Etymology

Origin of loony

First recorded in 1860–65; lun(atic) + -y 2

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

“Is this full-moon business true? Does he actually turn loony once a month?”

From Literature

Owens brings a blend of loony energy and sincere malevolence that Cooper can’t quite muster.

From Salon

Reminders of such loony moments as Wilder’s “blue blanket” meltdown underscore the actor’s unbridled genius.

From Los Angeles Times

It’s possible it’d be even loonier than what we have now.

From Seattle Times

“I cannot believe you would stoop this low! I told you I would not go anywhere near your loony cousin!”

From Literature

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.