be as thick as two short planks

(British informal) also be as thick as shit (British taboo!)

to be very stupid He might be good-looking but he's as thick as two short planks. Most of the people who read these papers are as thick as shit anyway.

Common Names:

Name	Pronounced	Usage
Jacquelyn	JAK-ə-lin	English
Dudda	-	Anglo-Saxon
Sabah Ud-Din	-	Arabic (Rare)
BoŽA	-	Serbian
Larissa	lə-RIS-ə (English)	English, Portuguese (Brazilian), Greek Mythology (Latinized)
Clements	['klemənts]