Definition from Wiktionary, the free dictionary
Alternative forms 
idiocy (plural idiocies)
- (psychology) The state or condition of being an idiot; the quality of having an intelligence level far below average; mental retardation.
- An act lacking intelligence or sense; an instance of senselessness; extremely foolish behaviour.
- The administrators, growing tired of such idiocy, put a new policy in place.
Related terms 
state of being an idiot
- idiocy at OneLook Dictionary Search