Holding beliefs, or having attitudes thought to be primitive or uncivilised; hence apelike(adjective)
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Use "knuckle-dragging" in a sentence
"What I should have seen coming was the portrayal of parents who opposed the changed to the Ontario sex-ed curriculum as knuckle-dragging right-wing bigots."
"Within hours of each man's fighting words, party and interest-group money-raisers were churning out paragraphs of outrage and YouTube links soliciting the $5, $10, or $2,000 donations they say are necessary to keep the "knuckle-dragging Neanderthals" on the other side (a term Grayson used to describe Republicans) from storming the castle."
"At a time when many Democrats are running to the right, freshman Rep. Alan Grayson has aggressively defended a position on the left, called Republicans "foot-dragging, knuckle-dragging Neanderthals" and labeled his opponent "Taliban Dan.""