Lunacy definition

lo͝onə-sē
Frequency:
The definition of lunacy is the state of being insane or wild foolishness.

An example of lunacy is college students and intense partying over Spring break.

noun
0
0
Mental derangement; craziness.
noun
0
0
(archaic) Intermittent mental derangement attributed to the changing phases of the moon.
noun
0
0
Great or wild foolishness.

A policy that proved to be a piece of economic lunacy.

noun
0
0
A wildly foolish or irrational act.
noun
0
0
Advertisement
Great folly or a foolish act.
noun
0
0
(obs.) Intermittent insanity, formerly supposed to change in intensity with the phases of the moon.
noun
0
0
Mental unsoundness; insanity.
noun
0
0
(of a person or group of people) The state of being mad, insanity.
  • A cyclical mental disease, apparently linked to the lunar phases.
  • Insanity implying legal irresponsibility.
noun
0
0
Something deeply misguided.
noun
0
0
Advertisement

Other Word Forms

Noun

Singular:
lunacy
Plural:
lunacies

Origin of lunacy

  • From lunatic

    From American Heritage Dictionary of the English Language, 5th Edition

  • From lunatic + -cy.

    From Wiktionary