(a)undimmed, brightnot made dim or less bright“undimmed headlights”, “surprisingly the curtain started to rise while the houselights were still undimmed”
(s)bright, smartcharacterized by quickness and ease in learning“some children are brighter in one subject than another”, “smart children talk earlier than the average”
(s)bright, burnished, lustrous, shining, shinymade smooth and bright by or as if by rubbing; reflecting a sheen or glow“bright silver candlesticks”, “a burnished brass knocker”, “she brushed her hair until it fell in lustrous auburn waves”, “rows of shining glasses”, “shiny black patents”
(s)bright, hopeful, promisinglikely to turn out well in the future“had a bright future in publishing”, “the scandal threatened an abrupt end to a promising political career”, “a hopeful new singer on Broadway”