stupidity
n. uncountablen. a lack of good sense or intelligence. You use this to describe a person's behavior when they make a very poor or silly choice.
n. the quality or state of being dull in mind or lacking in common sense. Often used to describe specific actions or general intellectual capacity.
I can't believe the stupidity of that decision.
The manager was frustrated by the sheer stupidity of leaving the front door unlocked overnight.
While some errors are born of ignorance, this particular failure was a result of pure stupidity, as the risks were clearly explained and documented beforehand.
From Latin stupiditātem, accusative of Latin stupiditās, equivalent to stupid + -ity.
Uncountable when referring to the general quality; occasionally used as a countable noun when referring to specific instances or acts.