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Adjective: lackluster  'lak,lús-tur
Usage: US (elsewhere: lacklustre)
  1. Lacking brilliance or vitality
    "a dull lackluster life";
    - lacklustre [Brit, Cdn], lusterless [N. Amer], lustreless [Brit, Cdn]
     
  2. Lacking luster or shine
    "staring with lackluster eyes";
    - lacklustre [Brit, Cdn], lusterless [N. Amer], lustreless [Brit, Cdn]

See also: dull, hebetudinous [rare]

Encyclopedia: Lackluster