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

See also: dull, hebetudinous [rare]

Encyclopedia: Lacklustre