形容词无光泽的，无光彩的，平淡乏味的

adj

1. lacking luster or shine

    e.g. staring with lackluster eyes
           lusterless hair

    Synonym: lacklusterlacklustrelusterless

2. lacking brilliance or vitality

    e.g. a dull lackluster life
           a lusterless performance

    Synonym: lacklusterlacklustrelusterless