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тупой как пробкаstresses
gen. dumb as a tree (matchin); stupid as a goose (z484z); several cards short of a full deck (Taras)
Игорь Миг one sandwich short of a picnic
austral., slang as thick as two short planks
idiom. dumb as a rock (Donald Trump, 2018 Alex_Odeychuk); thick as a brick (о человеке, не отличающимся развитым интеллектом :)) rusil1); as sharp as a marble (Some people are about as sharp as a marble. ART Vancouver); dumb as soup (flammeverte)
inf. dumb as dirt (joyand)
irish.lang. blunt as a bag of wet mice (Wakeful dormouse); sharp as a bag of wet mice (Wakeful dormouse)
pejor. dumber than a sack of potatoes (Ying)
scottish thick as mince (joyand)