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[id-ee-uh-see] /ˈɪd i ə si/
noun, plural idiocies.
utterly senseless or foolish behavior; a stupid or foolish act, statement, etc.:
All this talk of zombies coming to attack us is pure idiocy.
Psychology. (no longer in technical use; considered offensive) the state of being an idiot.
Origin of idiocy
1520-30; idio(t) + -cy; compare Greek idiōteía uncouthness
1. foolishness, inanity, folly. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Examples from the Web for idiocies
Contemporary Examples
Historical Examples
  • When will you get rid of your idiocies, and conduct yourself like a decent woman?

    A Pair of Blue Eyes Thomas Hardy
  • Who has not groaned over the follies and idiocies that cling to us like the doggerel verses that hang about our memories?

    Bunyan James Anthony Froude
  • Each morning he gloomily recognized his idiocies of the evening before.

    Babbitt Sinclair Lewis
British Dictionary definitions for idiocies


noun (pl) -cies
(not in technical usage) severe mental retardation
foolishness or senselessness; stupidity
a foolish act or remark
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
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Word Origin and History for idiocies



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

Online Etymology Dictionary, © 2010 Douglas Harper
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idiocies in Medicine

idiocy id·i·o·cy (ĭd'ē-ə-sē)
The state or condition of being an idiot; profound mental retardation.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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