Wiktionary
a. (cx pejorative English) Holding beliefs, or having attitudes thought to be primitive or uncivilised.
Usage examples of "knuckle-dragging".
The knuckle-dragging bampot was hardly the scholarly type, but had evidently been a keen student of local history, and of that subject's incorrigible tendency to repeat itself.
But there was an admixture of other primates (notably, an orang-utan recovering from pneumonia) who refused to accord the Hanumans the respect they deserved, and so as they all fought their way upwind toward the market, variously scampering on all fours, waddling on all twos, knuckle-dragging, hopping on lamed feet, swinging from limbs of stately mango-trees, and stampeding over rooftops, they were acting out a sort of running Punch-and-Judy show, flinging coconuts and brandishing sticks at one another.