adj.无光泽的；暗淡的；无生气的
n.无光泽；暗淡 无生气；平凡
The audience was disappointed and rather angry when the famous musician performed in a lackluster manner after arriving late for the concert. 这位著名的音乐家演出迟到后平平淡淡地表演了一番，观众很失望，非常生气。
