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English definition of “stupid”

stupid

adjective uk   /ˈstjuː.pɪd/ us    /ˈstuː-/
B1 silly or unwise; showing poor judgment or little intelligence: She was really stupid to quit her job like that. Whose stupid idea was it to travel at night? He now thinks that retiring early was a stupid thing to do. How could you be so stupid? informal annoying, or causing a problem: Have your stupid book back if it's so important to you. I hate doing this stupid exercise, I just can't get it right.
stupid
noun [as form of address] uk   informal us  
Don't lock it, stupid!
stupidly
adverb uk   /-li/ us  
Sorry, I stupidly forgot to bring my copy of the report - could I look at yours?
(Definition of stupid from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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