given to unintelligent decisions or acts : acting in an unintelligent or careless manner
Obama:"Cambridge police acted stupidly in arresting somebody when there was already proof that they were in their own home."
by steve14 July 23, 2009
1 more definition
some one whos verry dumb or acts dumb
your bro is acting very stupidly
by the heatons 1 December 28, 2008