Don’t be stupid!
Don’t do anything stupid!
He may be lowlife, but he isn’t stupid
I do not mean this personally, but that is a stupid point
I’m not that stupid!
Keep it simple and stupid
That was darn stupid of you!
The fundamental cause of the trouble is that in the modern world the stupid are cocksure while the intelligent are full of doubt
This is the type of stupid remark I can do without
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