mud Mud is a sticky mixture of earth and water. n-uncount His uniform was crumpled, untidy, splashed with mud...
mud-slinging
If you accuse someone of mud-slinging, you are accusing them of making insulting, unfair, and damaging remarks about their opponents. n-uncount
(disapproval)
Voters are disillusioned with the mud-slinging campaigns run by many candidates in recent years.
stick-in-the-mud (stick-in-the-muds plural )If you describe someone as a stick-in-the-mud, you disapprove of them because they do not like doing anything that is new or fun.
INFORMAL n-count
(disapproval)
(=fuddy-duddy)