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