have a bad case of the simples

Rur. to be stupid. That boy has a bad case of the simples. He can't understand anything. She acts smart enough on the playground, but get her in the classroom and she has a bad case of the simples.

Common Names:

Name	Pronounced	Usage
Meino	MIE-no (German, Dutch)	German, Dutch, Ancient Germanic
Gusti	-	Indonesian, Balinese
Budur	-	Arabic
Eudes	-	Medieval French
Springer	['spriŋə]
Gerhild	GER-hilt (German)	German, Ancient Germanic