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
Naomi (2)	nah-o-mee	Japanese
Madalitso	mah-dah-LEE-tso	Southern African, Chewa
Shelby	SHEL-bee	English
İLkİN	-	Turkish, Azerbaijani
Ludovicus	-	Ancient Germanic (Latinized)
Vijaya	-	Hinduism, Indian, Telugu, Kannada, Tamil, Malayalam, Marathi, Hindi