knuckleheaded (?.)
- beetleheaded
- blockheaded
- blunderheaded
- boneheaded
- cabbageheaded
- chowderheaded
- chuckleheaded
- clodpated
- dumbheaded
- dunderheaded
- fatheaded
- jolterheaded
- joltheaded
- lunkheaded
- muttonheaded
- nitwitted
- numskulled
- pumpkin-headed
- sapheaded
- stupidheaded
- woodenheaded
