the.com/blockheaded
stubbornly dense, like the thought never had a chance against the skull.
means describes someone thick-headed or obstinately stupid, resistant to reason or new information.
from from block, a solid unshaped chunk of wood, fused with head as early as the 1500s to mock people as dense as lumber.
shakespeare used itappears in troilus and cressida as an insult
wood metaphorblockhead literally means wooden head
american slang liferevived by comic strips and cartoons for dumb villains