look up any word, like bye felicia:
 
1.
a dumb fucking word that if used, ironically, means the speaker is stupid.

Speaker 1: Man, I'm so sick of all the stupidness in politics these days.

Speaker 2: Dude, what are you, a 7 year old? It's stupidity, dumbass. Stupidness isn't a word.
by Luke D April 22, 2008
 
2.
Describing how stupid/acknowledging how much of an imbecile one is being.
Teen: I'm gonna get in this shopping cart and fly off the roof!

Parent: That's the stupidest thing I've ever heard. I can just FEEL your stupidness levels rising.
by Kazaen June 21, 2011
 
3.
When someone does a silly act or says sumthing dumb..
Click the word to find out the example. stupidness
by N_a_t_a_l_i_e May 08, 2006