Lu·na·cy n.; pl. Lunacies
1. 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.
Your kindred shuns your house
As beaten hence by your strange lunacy. --Shak.
2. A morbid suspension of good sense or judgment, as through fanaticism.
Syn: -- Derangement; craziness; mania. See Insanity.