資料來源 : Webster's Revised Unabridged Dictionary (1913)

Lusterless \Lus"ter*less\, Lustreless \Lus"tre*less\, a.
   Destitute of luster; dim; dull.

資料來源 : WordNet®

lusterless
     adj 1: lacking brilliance or vitality; "a dull lackluster life"; "a
            lusterless performance" [syn: {lackluster}, {lacklustre},
             {lustreless}]
     2: lacking luster or shine; "staring with lackluster eyes";
        "lusterless hair" [syn: {lackluster}, {lacklustre}, {lustreless}]