noun, plural id·i·o·cies.

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

Synonyms for idiocy Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for idiocies

Contemporary Examples of idiocies

  • Idiocies multiply in direct proportion to the accumulating legal rigidities.

    The Daily Beast logo
    Red Tape Is Strangling Good Samaritans

    Philip K. Howard

    December 27, 2014

  • The paralyzing standoff between the two major American parties was dramatized by the idiocies of the debt-ceiling debate.

    The Daily Beast logo
    We’re Doomed!

    Charles R. Morris

    August 11, 2011

  • None of this means business needs to love government, or overlook its idiocies and inefficiencies.

    The Daily Beast logo
    Will Business Kill Health Care?

    Matt Miller

    June 15, 2009

Historical Examples of idiocies

  • When will you get rid of your idiocies, and conduct yourself like a decent woman?

  • Each morning he gloomily recognized his idiocies of the evening before.


    Sinclair Lewis

  • Who has not groaned over the follies and idiocies that cling to us like the doggerel verses that hang about our memories?


    James Anthony Froude

British Dictionary definitions for idiocies


noun plural -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

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

idiocies in Medicine




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.