deutschdictionary
noun
(LACK OF INTELLIGENCE OR COMMON SENSE)
His stupidity has cost him. - Seine Dummheit hat ihn gekostet.
(LACK OF GOOD SENSE OR JUDGMENT)
The foolishness of the decision was obvious. - Die Dummheit der Entscheidung war offensichtlich.
(EXTREME FOOLISHNESS OR STUPIDITY)
His behavior was pure idiocy. - Sein Verhalten war pure Dummheit.