(as) thick as two short planks

US /əz θɪk əz tuː ʃɔrt plæŋks/
UK /əz θɪk əz tuː ʃɔrt plæŋks/
"(as) thick as two short planks" picture
1.

stupido come una capra, tonto come un sasso

very stupid

:
He's (as) thick as two short planks, he never understands anything.
È stupido come una capra, non capisce mai niente.
You'd have to be as thick as two short planks to believe that story.
Dovresti essere stupido come una capra per credere a quella storia.