"dingiest" in the adjective sense
1. begrimed, dingy, grimy, grubby, grungy, raunchy
thickly covered with ingrained dirt or soot
"a miner's begrimed face"
"dingy linen"
"grimy hands"
"grubby little fingers"
"a grungy kitchen"
2. 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"
3. blue, dark, dingy, disconsolate, dismal, gloomy, grim, sorry, drab, drear, dreary
causing dejection
"a blue day"
"the dark days of the war"
"a week of rainy depressing weather"
"a disconsolate winter landscape"
"the first dismal dispiriting days of November"
"a dark gloomy day"
"grim rainy weather"
Source: WordNet® (An amazing lexical database of English)
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