Insanity or madness; properly, the kind of insanity which is broken by intervals of reason, -- formerly supposed to be influenced by the changes of the moon; any form of unsoundness of mind, except idiocy; mental derangement or alienation.
- Insanity, especially insanity relieved intermittently by periods of clear-mindedness. See Synonyms at insanity.
- Great or wild foolishness.
- A wildly foolish act.
- Archaic Intermittent mental derangement associated with the changing phases of the moon.