(a.) Having a large head; thickheaded; dull; stupid.

beetleheaded blockish blunderheaded boneheaded cabbageheaded chowderheaded chuckleheaded clodpated dumbheaded dunderheaded fatheaded jolterheaded joltheaded knuckleheaded lunkheaded muttonheaded nitwitted numskulled pumpkin-headed sapheaded stupid stupidheaded thick thickheaded woodenheaded