Stu*pid"i*ty (?), n. [L. stupiditas: cf. F. stupidité.] 1. The quality or state of being stupid; extreme dullness of perception or understanding; insensibility; sluggishness.

2. Stupor; astonishment; stupefaction. [R.]

A stupidity
Past admiration strikes me, joined with fear.

Stu*pid"i*ty (?), n. [L. stupiditas: cf. F. stupidité.] 1. The quality or state of being stupid; extreme dullness of perception or understanding; insensibility; sluggishness.

2. Stupor; astonishment; stupefaction. [R.]

A stupidity
Past admiration strikes me, joined with fear.

• The property of being stupid.
       I suppose you can put it down to gross stupidity, but that's not much of an excuse.
  
• An act that is stupid.
       That stupidity cost me the job interview.
  
• Obstinacy.