Dictionary

lunacy

lunacy

noun lu·na·cy \ˈlü-nə-sē\

: extreme foolishness

: something that is very foolish

: extreme mental illness

plural lu·na·cies

Full Definition of LUNACY

1
a :  insanity
b :  intermittent insanity once believed to be related to phases of the moon
2
:  wild foolishness :  extravagant folly
3
:  a foolish act

Examples of LUNACY

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

Origin of LUNACY

lunatic
First Known Use: 1541

Other Psychology Terms

fetish, hypochondria, intelligence, mania, narcissism, neurosis, pathological, psychosis, schadenfreude, subliminal

lunacy

noun lu·na·cy \ˈlü-nə-sē\   (Medical Dictionary)
plural lu·na·cies

Medical Definition of LUNACY

:  insanity; also :  intermittent insanity once believed to be related to phases of the moon

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