Mumpsimus (n)
mump-si-mus
A traditional custom or idea adhered to although shown to be unreasonable.
A person who obstinately adheres to old customs or ideas in spite of evidence that they are wrong or unreasonable
Example sentences
“Oh she’s such a mumpsimus, she’d still have you believe getting wet gives you a cold. ”
“It doesn’t matter how much science proves itself, he holds on to the mumpsimus of the Earth being flat.”

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