THICKHEAD Meaning of THICKHEAD in English ˈ ̷ ̷ˌ ̷ ̷ noun 1.a. : whistler 1b(1)b. : a thick-knee ( Burhinus capensis ) of southern Africa2. : a stupid person : blockhead3. : bluetongue 1 Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012