Definition of “stupid” - English Dictionary

“stupid” in English

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uk /ˈstjuː.pɪd/ us /ˈstuː.pɪd/

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.

More examples

  • That was a really stupid thing to do.
  • How could he be so stupid?
  • I'm sorry! That was a stupid thing to say - I don't know what came over me.
  • Don't be so stupid.
  • She told me it was brand new and I was stupid enough to believe her.
noun [ as form of address ] uk us informal

Don't lock it, stupid!
adverb uk /ˈstjuː.pɪ us /ˈstuː.pɪ

Sorry, I stupidly forgot to bring my copy of the report - could I look at yours?

(Definition of “stupid” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

“stupid” in American English

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us /ˈstu·pɪd/

lacking thought or intelligence:

I just made another stupid mistake.

infml You might say something is stupid because it annoys you:

Turn off that stupid program!
noun [ U ] us /stuˈpɪd·ɪ·t̬i/

Can you believe my stupidity? I locked my keys in the car!

(Definition of “stupid” from the Cambridge Academic Content Dictionary © Cambridge University Press)