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2.
A person who is of a low intellectual nature.
'Hey, you stupid person, you've just forgotten to go to work.'
by Exleper February 11, 2005
 
1.
95% of the people who submitted inane definiitions for this web-tionary
by I R STOOPID PEEPULLZ October 02, 2003
 
3.
Someone who knows better yet is doing or has intention to do something foolish.

Not to be associated with idiot; someone who has a lot of stupid ideas.
That stupid driver ran the light!
or
Look at that stupid person playing the tiger.
by TheGrimWeaper May 26, 2010