Synset

(of color) discolored by impurities; not bright and clear
<adj.all>   freq. cnt.: 1 freq. cnt.: 1

dingy

dirty

muddied

muddy

sample sentences

"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"