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noun, plural id·i·o·cies.
  1. utterly senseless or foolish behavior; a stupid or foolish act, statement, etc.: All this talk of zombies coming to attack us is pure idiocy.
  2. Psychology. (no longer in technical use; considered offensive) the state of being an idiot.
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Origin of idiocy

1520–30; idio(t) + -cy; compare Greek idiōteía uncouthness


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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for idiocy


noun plural -cies
  1. (not in technical usage) severe mental retardation
  2. foolishness or senselessness; stupidity
  3. a foolish act or remark
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for idiocy


1520s, from idiot on model of prophecy, etc. Early alternatives included idiotacy (1580s), idiotry (1590s).

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Online Etymology Dictionary, © 2010 Douglas Harper

idiocy in Medicine


  1. The state or condition of being an idiot; profound mental retardation.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.