He is a foolish boy.
She's a foolish interfering old woman!
The foolish boy was laughed at wherever he went.
The foolish girl insists on having her own way.
That foolish fellow is looking for trouble.
There were a lot of foolish answers given to the third examination question.
With this foolish action he had damned himself.
He could not account for his foolish mistake.
I know better than to do such a foolish thing.
Don't be foolish.
He looked rather foolish.
How foolish you should be if you were to take these words seriously.
You are foolish to say so.
He was foolish to believe her.
Mr. White was foolish to agree to the proposal.
He was foolish to take that expensive house.
We would be very foolish indeed to confine our vision to our national borders only.
He was foolish to let himself be pushed into doing what he knew was against both orders and common sense.
No one is foolish enough to endorse it.
It is/was+～+for〔of〕 sb+to- v
It is foolish of him to buy such expensive furniture.
Was it foolish of him to walk ten miles to return half a dollar he'd overcharged a customer?