The term 'more lustrous' can be described by four different crossword solutions: 'sleeker', 'silkier', 'BRIGHTER', and 'pearlier'. Sleeker is an adjective that means having a smooth, graceful, and stylish appearance. Silkier is an adjective that means having a soft, smooth texture like that of silk. BRIGHTER is an adjective that means having a strong, vivid color or light. Pearlier is an adjective that means having a pearly luster or sheen. All of these words describe something that is more lustrous than usual.