lunacy

noun
lu·​na·​cy | \ ˈlü-nə-sē How to pronounce lunacy (audio) \
plural lunacies

Definition of lunacy

1 dated

b : intermittent insanity once believed to be related to phases of the moon
2 : wild foolishness : extravagant folly
3 : a foolish act

Keep scrolling for more

Examples of lunacy in a Sentence

Quitting her job was lunacy. His idea was considered total lunacy.

Recent Examples on the Web

Yaron Brook of the Ayn Rand Institute says this is lunacy. John Stossel, Orange County Register, "A defense of the morality of capitalism," 19 June 2019 But, to be clear, many experts consider bold projections of celestial living to be, pardon the pun, lunacy. National Geographic, "Countdown to a new era inSpace," 17 June 2019 That listeners’ health can be a legitimate concern is only one of a dozen ways to measure the sheer lunacy this rivalry stirs up. Joshua Robinson, WSJ, "The Last Outpost of Pure Soccer Mayhem," 23 Nov. 2018 The lunacy was somewhat suppressed under George W. Bush, or at least (fitfully) kept separate from the administration itself. David Roberts, Vox, "The caravan “invasion” and America’s epistemic crisis," 2 Nov. 2018 These gamers sensed that running the ball with your quarterback under center, to obey traditions that dated back to leather helmets and a time when the forward pass wasn’t even legal, was nothing short of lunacy. Andrew Beaton, WSJ, "The NBA and NFL Have Become Videogames," 6 Nov. 2018 The Cup has driven some men to lunacy, others to bankruptcy. Luke O'brien, Town & Country, "Hot Pursuit," 1 Sep. 2013 On top of this, the reaction of young Elliott to the news that football's coming home would be the exact feeling of lunacy that would greet us all if England do win the World Cup this weekend. SI.com, "It's Coming Home: 6 of the Best England World Cup Memes of the Summer So Far," 11 July 2018 Despite being an Arizona senator for the past 32 years, he’s done nothing to address the open-border lunacy and invasion that’s increased crime and strained the resources of his own state. Ed Stockly, latimes.com, "Calendar Letters: Jane Pauley, John McCain, Roseanne Barr and more," 31 May 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'lunacy.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

See More

First Known Use of lunacy

1541, in the meaning defined at sense 1a

History and Etymology for lunacy

lunatic

Keep scrolling for more

Learn More about lunacy

Dictionary Entries near lunacy

Lumumba

lumut

luna

lunacy

luna moth

Luna Park

lunar

Statistics for lunacy

Last Updated

24 Jun 2019

Look-up Popularity

Time Traveler for lunacy

The first known use of lunacy was in 1541

See more words from the same year

Keep scrolling for more

More Definitions for lunacy

lunacy

noun
lu·​na·​cy | \ ˈlü-nə-sē How to pronounce lunacy (audio) \
plural lunacies

Medical Definition of lunacy

dated
: mental illness also : intermittent mental illness once believed to be related to phases of the moon

lunacy

noun
lu·​na·​cy | \ ˈlü-nə-sē How to pronounce lunacy (audio) \

Legal Definition of lunacy

Keep scrolling for more

More from Merriam-Webster on lunacy

Thesaurus: All synonyms and antonyms for lunacy

Spanish Central: Translation of lunacy

Nglish: Translation of lunacy for Spanish Speakers

Britannica English: Translation of lunacy for Arabic Speakers

Comments on lunacy

What made you want to look up lunacy? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

characterized by aphorism

Get Word of the Day daily email!

Test Your Vocabulary

Farm Idioms Quiz

  • cow coming home
  • What does 'poke' refer to in the expression 'pig in a poke'?
How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!

TAKE THE QUIZ
Dictionary Devil

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!