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

• bump into
• bumpkin
• bumpkinish
• bumpkins
• bump off
• bumpologies
• bumpology
• bumps
• bumpsadaisy
• bump-start
• bump-started
• bump-starting
• bump-starts
• bumptious
• bumptiously
• bumptiousness
• bumptiousnesses
• bump up
• bumpy
• bum rap
• bum raps
• bum roll
• bum rolls
• bums
• bums on seats