numskull or numbskull /numˈskul/ (informal)

A blockhead

• colcannons
• colchica
• colchicine
• colchicines
• colchicum
• colchicums
• colcothar
• colcothars
• cold
• cold as charity
• coldblood
• cold-blooded
• cold-bloodedly
• cold-bloodedness
• coldbloods
• cold boot
• cold-boot
• cold-booted
• cold-booting
• cold boots
• cold-boots
• cold cathode
• cold cathodes
• cold chisel
• cold chisels