Stick in the mud 保守
如果一個人被形容為 stick in the mud 那就說明此人很保守，墨守成規，不喜歡新事物，缺乏創意。
John is such a stick in the mud, he never wants to go anywhere other than Spain for his holiday.
Don't be a stick in the mud; let's try the other restaurant for a change.
不要混淆另一個短語的意思。As clear as mud 意思是混亂，不清晰。
For example: His instructions were as clear as mud.