"a dull lackluster life" "a lusterless performance"
lacking luster or shine;
"staring with lackluster eyes" "lusterless hair"
例句
用作形容词(adj.)
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。