- comparative form of : more stupid
- 1985, Walker Percy; Lewis A. Lawson, Victor A. Kramer, Conversations with Walker Percy, page 165:
- 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.
- 2002, Elizabeth George, A Traitor to Memory, page 827:
- "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.
- More common in American English. Less common in British English.
- Occasional target of prescriptivists, despite common usage.