be (as) thick as a brick

To be remarkably stupid, dimwitted, or obtuse. I smoked a lot of marijuana when I was in high school, so I was as thick as a brick by the time I finally graduated. Jen's new girlfriend is very nice, but she's thick as a brick.

Common Names:

Name	Pronounced	Usage
Eleanor	['elinə]
Elva	['elvə]
Voldemaras	-	Lithuanian
Cecilia	sə-SEE-lee-ə (English), sə-SEEL-yə (English), che-CHEE-lyah (Italian), the-THEE-lyah (Spanish), se-SEE-lyah (Latin American Spanish), se-SEEL-yah (Danish, Norwegian), SE-see-lee-ah (Finnish)	English, Italian, Spanish, Swedish, Danish, Norwegian, Finnish, Dutch, German
Laelia	-	Ancient Roman
Sienna	see-EN-ə	English (Modern)