idiocy

noun3

1. •
   Lack of intelligence or sense; extremely foolish behaviour.

   • The administrators, growing tired of such idiocy, put a new policy in place.
2. •
   An idiotic act or utterance.

   • The list of his idiocies is seemingly interminable.
3. •
   (offensive, old-fashioned) The state or condition of being an idiot; the quality of having an intelligence level far below average.