WordWeb Online

1. Extremely exhausted
   "felt completely washed-out";
   - knackered [Brit, informal], drained, zonked [informal], zonked out [informal], stonkered [Brit, Austral, NZ, informal], deadbeat [Brit, informal], shagged out [Brit, informal], shagged [Brit, informal], shattered [Brit, informal], exhausted, dog-tired [informal], fagged [Brit, informal], fatigued, played out, spent, worn-out, worn out, gone, shot [informal], fried [N. Amer, informal], pooped [N. Amer, informal]
    
2. Having lost freshness or brilliance of colour
   "a very pale washed-out blue";
   - bleached, faded, washy

See also: colorless [US], colourless [Brit, Cdn], tired