1 The state of being a lunatic.

Meaning of lunacy. Intermittent insanity once believed to be related to phases of the moon. Unsoundness of mind sufficient to incapacitate one for civil transactions. Originally in reference to intermittent periods of insanity such as were believed to be triggered by the moons cycle.

Stupid behavior that will. Extreme foolishness or an instance of it. Her decision to resign was sheer lunacy.

The definition of lunacy is the state of being insane or wild foolishness. Insanity was formerly thought to be affected by the moon. What does lunacy mean.

11 As with the fool in King Lear there is wisdom in his lunacy. If you describe someones behaviour as lunacy you mean that it seems very strange or foolish. The Indians thought his obsession with giant bones a sign of harmless lunacy.

LUNACY noun The noun LUNACY has 2 senses. Lunacy meaning definition what is lunacy. 45 synonyms of lunacy from the Merriam-Webster Thesaurus plus 67 related words definitions and antonyms.

Behaviour that is stupid or crazy synonym madness. LUNACY used as a noun is rare. One might have expected it to be the other way around.