Definition of "lunacy" []

• Insanity, especially insanity relieved intermittently by periods of clear-mindedness. See Synonyms at insanity. (noun)
• Great or wild foolishness. (noun)
• A wildly foolish act. (noun)
• Archaic Intermittent mental derangement associated with the changing phases of the moon. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "The only beneficiaries of letting Hillary continue in her lunacy is the media and the Republican party."
• "In folklore, a full moon is associated with insanity - hence the word lunacy - werewolves and all manner of unpleasant happenings."
• "He didn't use the word lunacy, but he indicated Monday he had spoken to Martz about achieving a pass-run balance that is somewhat less ridiculous."