luster (US) noun
or British lustre /ˈlʌstɚ/ or British lustre /ˈlʌstɚ/ Learner's definition of LUSTER
[singular]
1
: the shiny quality of a surface that reflects light光泽 -
the luster of polished metal打磨过的金属的光泽
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He polished the silverware for hours trying to restore its luster.他花了几小时擦拭银器，试图使其恢复光泽。
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the luster of her eyes她双眸的光彩
2
: an appealing, exciting, or admired quality光辉；光彩 -
The trip loses some of its luster [=it becomes less appealing or exciting] after you've done it several times.这段旅途走过多次后，就失去了原有的一些光彩。
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The scandals have tarnished/dimmed his luster. [=damaged his reputation]丑闻损害了他的名誉。
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the luster [=renown] of the family's name家族名声的荣耀
— lusterless
(US) or British lustreless adjective — lustrous
/ˈlʌstrəs/ adjective [more lustrous; most lustrous]