or British lustre
1 : the shiny quality of a surface that reflects light
the luster of polished metal
He polished the silverware for hours trying to restore its luster.
the luster of her eyes
2 : an appealing, exciting, or admired quality
The trip loses some of its luster [=it becomes less appealing or exciting] after you've done it several times.
The scandals have tarnished/dimmed his luster. [=damaged his reputation]
the luster [=renown] of the family's name
— lusterless (US) or British lustreless adjective
dull lusterless eyes
— lustrous /ˈlʌstrəs/ adjective [more lustrous; most lustrous]
a lustrous [=shining] surface