numskull or numbskull /numˈskul/ (informal)

A blockhead

• direct-grant schools
• directing
• direct injection
• direction
• directional
• directional aerial
• directional aerials
• directional drilling
• directionality
• directional microphone
• directional microphones
• direction-finder
• direction-finders
• direction-indicator
• de-emphasising
• de-emphasize
• de-emphasized
• de-emphasizes
• de-emphasizing
• deems
• deemster
• deemsters
• deen
• de-energise
• de-energised