lunacy

Mental derangement; craziness.

Intermittent mental derangement attributed to the changing phases of the moon.

Great or wild foolishness.

A wildly foolish or irrational act.

The kind of intermittent insanity formerly supposed to be subject to the change’s of the moon; hence, madness in general; any unsoundness of mind. See insanity.

In law, unsoundness of mind sufficient to incapacitate for civil transactions. The usual test is incapacity to manage one’s own property and affairs.

Synonyms Derangement, Craziness, etc. See insanity.

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.