"the ground was boggy under foot"
"a marshy coastline"
"miry roads"
"wet mucky lowland"
"muddy barnyard"
"quaggy terrain"
"the sloughy edge of the pond"
"swampy bayous"
dirty and messy; covered with mud or muck;
"muddy boots"
"a mucky stable"
(of color) discolored by impurities; not bright and clear;
"dirty"
"a dirty (or dingy) white"
"the muddied grey of the sea"
"muddy colors"
"dirty-green walls"
"dirty-blonde hair"