The Collaborative International Dictionary of English v.0.48:

Faded \Fad"ed\, a.
   That has lost freshness, color, or brightness; grown dim.
   "His faded cheek." --Milton.
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         Where the faded moon
         Made a dim silver twilight.              --Keats.
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The Collaborative International Dictionary of English v.0.48:

Fade \Fade\, v. i. [imp. & p. p. Faded; p. pr. & vb. n.
   Fading.] [OE. faden, vaden, prob. fr. fade, a.; cf. Prov.
   D. vadden to fade, wither, vaddigh languid, torpid. Cf.
   Fade, a., Vade.]
   1. To become fade; to grow weak; to lose strength; to decay;
      to perish gradually; to wither, as a plant.
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            The earth mourneth and fadeth away.   --Is. xxiv. 4.
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   2. To lose freshness, color, or brightness; to become faint
      in hue or tint; hence, to be wanting in color. "Flowers
      that never fade." --Milton.
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   3. To sink away; to disappear gradually; to grow dim; to
      vanish.
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            The stars shall fade away.            --Addison
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            He makes a swanlike end,
            Fading in music.                      --Shak.
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WordNet (r) 3.0 (2006):

faded
    adj 1: having lost freshness or brilliance of color; "sun-
           bleached deck chairs"; "faded jeans"; "a very pale
           washed-out blue"; "washy colors" [syn: bleached,
           faded, washed-out, washy]
    2: reduced in strength; "the faded tones of an old recording"
       [syn: attenuate, attenuated, faded, weakened]

Moby Thesaurus II by Grady Ward, 1.0:

76 Moby Thesaurus words for "faded":
   achromatic, achromic, anemic, ashen, ashy, bedraggled, blanched,
   bleached, bled white, bloodless, cadaverous, chloranemic,
   colorless, dead, deadly pale, deathly pale, dim, dimmed, dingy,
   discolored, dull, eroded, etiolated, exsanguinated, exsanguine,
   exsanguineous, faint, fallow, flat, ghastly, gray, haggard,
   hueless, hypochromic, lackluster, leaden, livid, lurid, lusterless,
   mat, mealy, muddy, murky, neutral, pale, pale as death, pale-faced,
   pallid, pasty, run-down, sallow, seedy, shabby, sickly, tacky,
   tallow-faced, tattered, threadbare, tired, toneless, uncolored,
   wan, washed-out, wasted, waxen, weak, weather-battered,
   weather-beaten, weather-bitten, weather-eaten, weather-wasted,
   weathered, weatherworn, whey-faced, white, worn