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

• overbites
• overblanket
• overblankets
• overblew
• overblow
• overblowing
• overblown
• overblows
• overboard
• overboil
• overboiled
• overboiling
• overboils
• overbold
• overboldly
• overbook
• overbooked
• overbooking
• overbooks
• overbore
• overborne
• overbought
• overbound
• overbounded
• overbounding