stick-in-the-mud
noun
[ ˈstɪkɪnðəˌmʌd ]
• a person who is dull and unadventurous and who resists change.
• "they see many of their colleagues as stick-in-the-muds and sentimental neanderthals"
Similar:
(old) fogey,
conservative,
museum piece,
fossil,
dinosaur,
troglodyte,
fuddy-duddy,
square,
back number,
stuffed shirt,
sobersides,
