Definition from macmillandictionary.com
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Barbara’s too stupid to understand.
I didn’t ask because I was afraid of looking stupid.
What a stupid question.
This may sound stupid, but just give it a try.
I was stupid enough to listen to him.
It was so stupid of her to interfere.
What a stupid haircut!
It was a really stupid argument.
He kept singing the same stupid song.
Does this shirt look stupid?
‘I didn’t recognize you,’ I said stupidly.
I stupidly loaned him some money.