[ id-ee-uh-see ]
See synonyms for: idiocyidiocies on

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) an intellectual disability, previously classified in a now obsolete rubric of developmental disorders as having a mental age of less than three years old and an intelligence quotient under 25.

Origin of idiocy

First recorded in 1520–30; from Medieval Latin idiotia “imbecility,” from Hellenistic Greek idiōteía “uncouthness, ignorance,” Greek “state of being a private person”; see origin at idiot, -cy

Other words for idiocy

Words Nearby idiocy Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2024

How to use idiocy in a sentence

British Dictionary definitions for idiocy


/ (ˈɪdɪəsɪ) /

nounplural -cies
  1. (not in technical usage) severe mental retardation

  2. foolishness or senselessness; stupidity

  1. 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