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Noun: lunacy  loo-nu-see
  1. Foolish or senseless behaviour
    - folly, foolery, tomfoolery, craziness, indulgence
  2. [archaic] Obsolete term for legal insanity
    - madness [archaic], insaneness [archaic]

Derived forms: lunacies

Type of: caper [informal], craziness [informal], frolic, gambol, insanity, madness, play, romp

Encyclopedia: Lunacy