The phrase "a foolish person" is correct and usable in written English.
It can be used to describe someone who acts unwisely or lacks good judgment.
Example: "Despite his intelligence, he often makes decisions that label him as a foolish person."
Alternatives: "a silly individual" or "an imprudent person."
"It's a foolish person who tries this," Ms. Pressberg said.
Only a foolish person would not want it".
I know someone has said men don't make passes at girls who wear glasses, but that's an idea for a foolish person.
It would be a foolish person, he says, who looked at the boy flying the kite and thought the boy controlled the wind or the wind controlled the boy.
It would be a foolish person to stand between Katie and a wedding dress, and before long all four women are standing stony-faced in an assortment of bridal gowns.
"I think it would be a foolish person who went on to Desert Island Discs thinking they could 'use it with a capital U'".
— January , 1995 during a press conference on Capitol Hill "I'm calling you a remarkably foolish person for having that kind of conversation here, and I am very sorry you have cared to bring what Connie Chung did back into the public arena.
You would have to be sick yourself, or a terribly foolish person, to think the root of all of this isn't clearly 40 years of economic decline and a lot of psychological stress.
Soon, it'll just be a memory....[S]ome foolish person, will probably think it's a tribute to this city, the way it keeps changing on you, the way you can never count on it... .. My friends and I have been going to La Lunchonette since our college years, well over a decade ago, having discovered it by way of Andy Spade's award winning, 2002 ad campaign called "Visiting Tennessee".
Archaic slang terms include "nause" (an unpleasant person); "crackle" (money); "crackling" (attractive female); "erdie", "erber", "nerk" and "erk" – all meaning a foolish, unfashionable person.
In the end, he was proud of me but it took a long time, and for a while he thought I was a foolish, frivolous person.
