Terms for subject Idiomatic containing as thick as

English	Russian
as thick as a plank	тупой как валенок (Andrey Truhachev)
thick as a brick	тупой (Floyd1)
thick as a brick	тупой как пробка (о человеке, не отличающимся развитым интеллектом :)) rusil1)
thick as a brick	глупый как пробка (VLZ_58)
thick as thieves	водой не разольёшь
thick as thieves	закадычные друзья (VLZ_58)
thick as two short planks	тупой (Floyd1)
as thick as two short planks	тупой как валенок (Andrey Truhachev)