Displaying a complete lack of forethought and good sense
So senseless as to be laughable
It had been foolish to climb into the car with him.
It was a foolish thing to say.
Perhaps it was a foolish thing to do.
No, you're just foolish enough to jump from the buggy.
While Dean felt foolish, he couldn't help feeling a tickle of pleasure as hundreds of people clapped and cheered as they passed.