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Lunacy definition

lo͝onə-sē
lunacies
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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.

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

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

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A wildly foolish or irrational act.
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Great folly or a foolish act.
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(obs.) Intermittent insanity, formerly supposed to change in intensity with the phases of the moon.
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Mental unsoundness; insanity.
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(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.
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Something deeply misguided.
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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

Lunacy Sentence Examples

  • The committee of a lunatic, with the sanction of the judge in lunacy, may refer disputes to arbitration.

  • The lunacy of her father and the depravity of her mother were serious drawbacks to Catherine, and her only education was obtained in a convent at Poissy.

  • The black abolitionists had respect for Brown but thought the plan lunacy.

  • Peter is also responsible for the Millenium Project (deliberate misspelling - explanation on the opening page) which further debunks more www lunacy.

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Words near lunacy in the Dictionary