English ⇄ Russian

knuckle-dragging stresses
gen.	закоснелый (From the habit of some primates of walking with the forelimbs dragging along the ground. Holding beliefs, or having attitudes thought to be primitive or uncivilised. КГА); узколобый (NumiTorum)
fig.	дремучий (He couldn’t believe they’d made that knuckle-dragging brownshirt a detective. Abysslooker)
knuckle dragging
invect.	примитивный (о человеке Баян); первобытный (о человеке Баян); дикий (о человеке Баян)