"dirty unswept sidewalks"
"a child in dirty overalls"
"dirty slums"
"piles of dirty dishes"
"put his dirty feet on the clean sheet"
"wore an unclean shirt"
"mining is a dirty job"
"Cinderella did the dirty work while her sisters preened themselves"
"dirty words"
"a dirty old man"
"dirty books and movies"
"boys telling dirty jokes"
"has a dirty mouth"
"a dirty (or lousy) trick"
"a filthy traitor"
"the air near the foundry was always dirty"
"a dirty bomb releases enormous amounts of long-lived radioactive fallout"
"dirty wounds"
"obliged to go into infected rooms"
"dirty"
"a dirty (or dingy) white"
"the muddied grey of the sea"
"muddy colors"
"dirty-green walls"
"dirty-blonde hair"
"foul (or dirty) copy"
"dirty money"
"ill-gotten gains"
"dirty looks"
"a dirty fighter"
"used foul means to gain power"
"a nasty unsporting serve"
"fined for unsportsmanlike behavior"
"dirty police officers"
"a sordid political campaign"
"there's dirty weather in the offing"
"don't soil your clothes when you play outside!"