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

• sprightful
• sprightfully
• sprightfulness
• sprightfulnesses
• sprighting
• sprightless
• sprightlier
• sprightliest
• sprightliness
• sprightlinesses
• sprightly
• sprights
• remotest
• remotion
• remotions
• remoud
• remoulade
• remoulades
• remould
• remoulded
• remoulding
• remoulds
• remount
• remounted
• remounting