(as) thick as two short planks
US /əz θɪk əz tuː ʃɔrt plæŋks/
UK /əz θɪk əz tuː ʃɔrt plæŋks/

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.