numskull or numbskull /numˈskul/ (informal)

A blockhead

numˈskulled adjective

• crispbread
• crispbreads
• crisped
• crisper
• crispers
• crispest
• crispier
• crispiest
• crispin
• crispiness
• crisping
• crispins
• crisply
• crispness
• crispnesses
• crisps
• crispy
• crissa
• criss-cross
• crisscross
• criss-crossed
• criss-crosses
• criss-crossing
• criss-cross-row
• crissum