dingy in WordNet English dictionary

1. thickly covered with ingrained dirt or soot
   "a miner's begrimed face"; "dingy linen"; "grimy hands"; "grubby little fingers"; "a grungy kitchen"
   begrimed  dingy  grimy  grubby  grungy  raunchy 
   
2. 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"
   blue  dark  dingy  disconsolate  dismal  gloomy  grim  sorry  drab  drear  dreary 
   
3. (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"
   dirty  dingy  muddied  muddy