[ id-ee-uh-see ]
/ ˈɪd i ə si /

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.

Nearby words

  1. idio-,
  2. idioagglutinin,
  3. idioblast,
  4. idiochromatic,
  5. idiocrasy,
  6. idiodynamic,
  7. idiodynamics,
  8. idioglossia,
  9. idiogram,
  10. idiograph

Origin of idiocy

1520–30; idio(t) + -cy; compare Greek idiōteía uncouthness Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for idiocies

British Dictionary definitions for idiocies


/ (ˈɪdɪəsɪ) /

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

Medicine definitions for idiocies


[ ĭdē-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.