Definition of stupid adjective from the Oxford Advanced American Dictionary

      

    stupid

     adjective
    adjective
    NAmE//ˈstupəd//
     
    (stupider, stupidest)
     
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  1. 1more stupid and most stupid are also common showing a lack of thought or good judgment synonym foolish, silly a stupid mistake It was a pretty stupid thing to do. I was stupid enough to believe him. It was stupid of you to get involved.
  2. 2 (disapproving) (of a person) slow to learn or understand things; not intelligent He'll manage—he isn't stupid. Forgetting my notes made me look stupid. She always makes me feel really stupid.
  3. 3[only before noun] (informal) used to emphasize that you are annoyed with someone or something I can't get the stupid thing open! Get your stupid feet off the chair!
  4.  
    adverb I stupidly agreed to lend him the money. Todd stared stupidly at the screen.
See the Oxford Advanced Learner's Dictionary entry: stupid