Definition of "stupider"

You people aren't stupider than anyone else. Not naturally stupider.

1928, Aldous Huxley, Point Counter Point‎, London: Chatto & Windus, page 142

Freud's disciples have been even more stupid about "creative writing". At least Freud had the good sense to know when to shut up, as he did in Dostoevski's case. But stupider still is the more recent Hemingway machismo number.

1985, Walker Percy with Lewis A. Lawson and Victor A. Kramer, Conversations with Walker Percy, page 165

"You'd be stupider / — "More stupid," she said. / — stupider," he repeated, "to find yourself dis'tangling your way out of a charge of obstruction in a police enquiry.

2002, Elizabeth George, A Traitor to Memory, page 827