"muddier" in the adjective sense
1. boggy, marshy, miry, mucky, muddy, quaggy, sloppy, sloughy, soggy, squashy, swampy, waterlogged
of soil) soft and watery
"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"
2. mucky, muddy
dirty and messy covered with mud or muck
"muddy boots"
"a mucky stable"
3. dirty, dingy, muddied, muddy
of color) discolored by impurities not bright and clear
"dirty" is often used in combination
"a dirty (or dingy) white"
"the muddied grey of the sea"
"muddy colors"
"dirty-green walls"
"dirty-blonde hair"
4. cloudy, muddy, mirky, murky, turbid
of liquids) clouded as with sediment
"a cloudy liquid"
"muddy coffee"
"murky waters"
Source: WordNet® (An amazing lexical database of English)
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