Yes, it is one of them, along with smartness and some other words.
incapabal
It can be both, because it depends on what you are comparing 'stupidity' to.
Synonyms of Acumen: awareness, brilliance, intelligence, understanding, sharpness, judgment, vision, grasp Antonyms of Acumen: ignorance, stupidity, inability, denseness
His stupidity led to the accident.It was a moment of stupidity.
"Stupidity and stupid" are nouns. It is not common to turn a noun into a verb - and even then it is not correct practice. I know of no verb form of 'stupidity'.
The study of stupidity is called monology.
That is the correct spelling of "stupidity" (inanity, foolishness).
Noun = stupidity Adverb = stupidly Adjective = stupid
In piglatin, "stupidity" would be said as "upiditystay."
The man used his quick cleverness in the dangerous situation.
the fear of The Bible is stupidity.
That is the correct spelling for "stupidity" and "contagious." (It isn't always.)