mumpsimus /mumpˈsi-məs/

1. A view or opinion stubbornly held, even when shown to be misguided
2. A person holding such a view, or one adhering stubbornly to old ways

• hoc genus omne
• hock
• hock-cart
• hock-carts
• Hock-day
• Hock-days
• hocked
• hocker
• hockers
• hockey
• hockey line
• hockeys
• hocking
• Hock Monday
• hocks
• Hock-tide
• Hock Tuesday
• hoc loco
• hoc tempore
• hocus
• hocused
• hocuses
• hocusing
• hocus-pocus
• hocus-pocused