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./