stick-in-the-mud
stick-in-the-mud {n.}, {informal}
An overcareful person; someone who is old-fashioned and fights change.
Mabel said her mother was a real stick-in-the-mud to make a rule that she must be home by 10 o'clock on weeknights and 11:30 Saturdays.
Mr. Thomas is a stick-in-the-mud who plows with mules; he won't buy a tractor.
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Source: A Dictionary of American Idioms
