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тупой как валенок contraintes
génér.	thick as two short planks (Anglophile); as thick as two short planks (Anglophile)
idiom.	nutty as a fruitcake (Andrey Truhachev); as thick as a plank (Andrey Truhachev); as dim as a glow worm's armpit (Andrey Truhachev); as thick as two short planks (Andrey Truhachev); dumb as a rock (Donald Trump, 2018 Alex_Odeychuk)
inform.	as stupid as a goose (VLZ_58); as dense as a donkey (VLZ_58)
тупые как валенки
idiom.	people that are dumb as rocks (Washington Post Alex_Odeychuk)
тупой, как сибирский валенок
en d.	as thick as a plank (тж. (as) thick as two (short) planks Баян)

тупой, как валенок: 5 phrases, 3 sujets

Général	2
Idiomatique	1
Informel	2