numskull or numbskull /numˈskul/ (informal)

A blockhead

numˈskulled adjective

• amplifiers
• amplifies
• amplify
• amplifying
• amplitude
• amplitude modulation
• amplitude modulations
• amplitudes
• amplosome
• amplosomes
• amply
• ampoule
• ampoules
• amps
• AMPS
• ampul
• ampule
• ampules
• ampulla
• ampullae
• ampullosities
• ampullosity
• ampuls
• amp up
• ampussy-and