lu·na·cy

[loo-nuh-see]
noun, plural lu·na·cies.
1.
insanity; mental disorder.
2.
intermittent insanity, formerly believed to be related to phases of the moon.
3.
extreme foolishness or an instance of it: Her decision to resign was sheer lunacy.
4.
Law. unsoundness of mind sufficient to incapacitate one for civil transactions.

Origin:
1535–45; lun(atic) + -acy


1. derangement, dementia; craziness, madness, mania, aberration. 3. folly, stupidity.


1, 2. rationality, sanity.
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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00:10
Lunacy is always a great word to know.
So is callithumpian. Does it mean:
a scrap or morsel of food left at a meal.
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
Collins
World English Dictionary
lunacy (ˈluːnəsɪ) [Click for IPA pronunciation guide]
 
n , pl -cies
1.  (formerly) any severe mental illness
2.  foolishness or a foolish act

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

lunacy
1540s, "condition of being a lunatic," formed in English from lunatic (q.v.). Originally in ref. to intermittent periods of insanity, such as were believed to be triggered by the moon's cycle. The O.E. equivalent was monaðseocnes "month-sickness."
Online Etymology Dictionary, © 2010 Douglas Harper
Cite This Source Link To lunacy
Example sentences
His descent into madness is rapid but not sudden, and his lunacy seems
  inevitable.
Lunacy in a family is not a particularly funny thing, nor does it seem fitting
  and tasteful as a matter to be treated as farce.
Extending into the private sector a policy that has been a disaster in the
  public sector is lunacy.
The climate of lunacy and lechery is not insalubrious for him.
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