numskull or numbskull /numˈskul/ (informal)

A blockhead

• endocarditic
• endocarditis
• endocarditises
• half-closes
• half-cock
• half-cocked
• half-cocks
• half-crown
• half-crowns
• half-cut
• half-day
• half-days
• half-dead
• half-dollar
• half-dollars
• half-done
• half-door
• half-doors
• half-dozen
• half-duplex
• halfe-horsy
• halfen
• halfendeale
• half-evergreen
• half-face