stupidity

noun

1. (uncountable)The property of being stupid.

   “I suppose you can put it down to gross stupidity, but that's not much of an excuse.”

   “And Vickers launched forth into a tirade very different from his platform utterances. He spoke with extreme contempt of the dense stupidity exhibited on all occasions by the working classes. He said that if you wanted to do anything for them, you must rule them, not pamper them. Soft heartedness caused more harm than good.”

2. (countable)An act that is stupid.

   “Jimmy's stupidity cost him his car.”

   “8. They require that crass stupidities shall not be played upon the reader as “the craft of the woodsman, the delicate art of the forest,” by either the author or the people in the tale.”