mumpsimus
/ˈmʌmpsɪməs/noun
(pl. mumpsimuses)
1- a traditional custom or notion adhered to although shown to be unreasonable不合情理但仍被坚持的风俗习惯（或观念）。
1.1
- a person who obstinately adheres to such a custom or notion顽固坚持不合理风俗习惯（或观念）的人。
词源
mid 16th cent.: erroneously for Latin sumpsimus in quod in ore sumpsimus 'which we have taken into the mouth' (Eucharist), in a story of an illiterate priest who, when corrected, replied 'I will not change my old mumpsimus for your new sumpsimus'.