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
Raf	RAHF	Dutch
SÉPhora	-	French
Avery	['eivəri]
Kathrine	-	Danish, Norwegian
Saturn	SA-tərn (English)	Roman Mythology (Anglicized)
ŽIvko	-	Croatian, Serbian