(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.

głupi jak but, bardzo głupi

very stupid

:
He's (as) thick as two short planks, he never understands anything.
Jest głupi jak but, nigdy niczego nie rozumie.
You'd have to be as thick as two short planks to believe that story.
Musiałbyś być głupi jak but, żeby uwierzyć w tę historię.