1 (uncountable) The property of being mentally ill; mental disorders taken as a whole.  2006, R. Keith Sawyer, Explaining Creativity: The Science of Human Innovation, Oxford University Press US, ISBN 9780195161649, page 87:
Essay on Gulliver's change throughout Gulliver's Travels - Gulliverâs change throughout Gulliverâs Travels Throughput the book âGulliverâs Travelsâ by Jonathan Swift, the character Gulliver changes many times. During and after part two and four of the book a noticeable change in Gulliver starts to occur.
By setting up the King of Brobdingnag as the fool who fails to recognize the powerful tool Gulliver is willing to put into his hands, Swift creates the dramatic contrast between the just ruler of this exotic land and the current King of England who, by implication, would embrace such a weapon in a heartbeat.