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Adjective: lusterless  lús-tur-lus
Usage: N. Amer (elsewhere: lustreless)
  1. Lacking brilliance or vitality
    "a lusterless performance";
    - lackluster [US], lacklustre [Brit, Cdn], lustreless [Brit, Cdn]
     
  2. Lacking luster or shine
    "lusterless hair";
    - lackluster [US], lacklustre [Brit, Cdn], lustreless [Brit, Cdn]

See also: dull, hebetudinous [rare]