What does the word insanity mean?

Usage examples for insanity

  1. There were old men who took to the woods and rocks in a state of partial insanity. – Leading Articles on Various Subjects by 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) by George Saintsbury
  3. Many other crimes, and almost all vices, are due to physical or mental disease, or to actual insanity. – The Subterranean Brotherhood by Julian Hawthorne