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Definition of lunacy:

  1. A morbid suspension of good sense or judgment, as through fanaticism.
  2. 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.

Synonyms:

rabidity, tomfoolery, betise, ability, nonsense, absurdity, fury, senselessness, indulging, idiocy, lenience, rabies, aberration, brainsickness, foolery, monomania, pampering, humoring, unwiseness, folly, self-indulgence, daftness, foolishness, alienation, indulgence, rabidness, flakiness, madness, disturbance, silliness, stupidity, unbalance, lyssa, imbecility, mental illness, rage, hydrophobia, sane, preposterousness, insaneness, psychopathy, zaniness, leniency.

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