stick in the mud

stick in the mud

Someone who is considered boring, often due to unpopular or outdated beliefs. Sally was tired of being called a stick in the mud by her friends just because she refused to drink alcohol. Just because I don't like roller coasters doesn't mean I'm a stick in a mud—I like lots of other fun things!
See also: mud, stick
Farlex Dictionary of Idioms.

stick-in-the-mud

Fig. a dull and old-fashioned person. Don't be such an old stick-in-the-mud. some stick-in-the-mud objected to the kind of music we wanted to play in church.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.

a stick-in-the-mud

If you call someone a stick-in-the-mud, you mean they are old-fashioned or boring and do not like doing new things or having fun. I felt sorry for him because he obviously wanted to enjoy himself but was married to a real stick-in-the-mud. Call me a stick-in-the-mud, but I just prefer the more traditional ways of doing things. Note: You can use stick-in-the-mud before a noun. He's going to let an opportunity pass him by, with his stick-in-the-mud attitude. Note: This expression is used to show disapproval.
Collins COBUILD Idioms Dictionary, 3rd ed.

stick in the mud

n. a dull and old-fashioned person. Don’t be such an old stick in the mud.
See also: mud, stick
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions

stick in the mud, old

A person who avoids anything new; an old fogy, not necessarily old in years. This expression, which presumably likens such an individual to a vehicle whose wheels are stuck in mud, has been around since about 1700. Thomas Haliburton used it in one of his Sam Slick tales (1843): “‘Well,’ said old Stick-in-the-mud, ‘what are you arter?’”
See also: old, stick
The Dictionary of Clichés by Christine Ammer
See also:
  • a stick-in-the-mud
  • stick-in-the-mud
  • stick in the mud, old
  • an old stick in the mud
  • behind the times
  • detract
  • detract from
  • detract from (someone or something)
  • flat-earther
  • on the wrong side of history