bub·ble·head 
(bŭbəl-hĕd′)
(bŭbəl-hĕd′)n.
A foolish or empty-headed person: "He presents antiwar protesters ... as bubbleheads who didn't even know where Southeast Asia was" (Frank Rich).
bubble·head′ed adj.
- tetraethyl pyrophosphate
- tetragon
- tetragonal
- tetragonally
- Tetragrammaton
- tetrahedral
- tetrahedrally
- tetrahedrite
- tetrahedron
- tetrahydrocannabinol
- tetrahydrofuran
- tetrahydroxy
- tetralogy
- tetralogy of Fallot
- tetramer
- tetrameric
- tetramerous
- tetramery
- tetrameter
- tetraplegia
- tetraplegic
- tetraploid
- tetraploidy
- tetrapod
- tetrarch