- a stupid, doltish person; dunce.
- Obsolete. a piece of wood in the shape of a head, used as a block for hats or wigs.
- derogatory a stupid person
also block-head, “stupid person,” 1540s (implied in blockheaded), from block (n.) + head (n.); probably originally an image of the head-shaped oaken block used by hat-makers, though the insulting sense is the older one.