idiocy

Etymology

From French idiotie, from Old French idiot. Displaced earlier idiotacy, idiotry.

noun

1. (dated, psychology, now derogatory) The state or condition of being an idiot; the quality of having an intelligence level far below average; mental retardation; intellectual disability.
2. (uncountable) Lack of intelligence or sense; extremely foolish behaviour.
   The administrators, growing tired of such idiocy, put a new policy in place.
3. (countable) An idiotic act or utterance.
   The list of his idiocies is seemingly interminable.