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

• stirk
• stirks
• stirless
• Stirling engine
• stir one's stumps
• stir out
• stirp
• stirpes
• stirpiculture
• swelts
• swept
• sweptback
• sweptwing
• swerf
• swerfed
• swerfing
• swerfs
• Swerga
• swerve
• swerved
• swerveless
• swerver
• swervers
• swerves
• swerving