Part of speech: noun

Mental disorder; derangement; lunacy.

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Usage examples "insanity":

  1. There were old men who took to the woods and rocks in a state of partial insanity. - "Leading Articles on Various Subjects", Hugh Miller.
  2. After nearly twenty busy years of journalism and authorship he shot himself in December 1856, as it is supposed in a fit of insanity brought on by overwork. - "A History of Nineteenth Century Literature (1780-1895)", George Saintsbury.
  3. Many other crimes, and almost all vices, are due to physical or mental disease, or to actual insanity. - "The Subterranean Brotherhood", Julian Hawthorne.