lunacy
noun
- Obsolete intermittent insanity, formerly supposed to change in intensity with the phases of the moon
- mental unsoundness; insanity
- pl. lunacies great folly or a foolish act
See lunacy in American Heritage Dictionary 4
(lo͞oˈnə-sē)
noun pl. lu·na·cies - Insanity, especially insanity relieved intermittently by periods of clear-mindedness. See Synonyms at insanity.
a. Great or wild foolishness.
b. A wildly foolish act.
- Archaic Intermittent mental derangement associated with the changing phases of the moon.
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