λαμπρός“shining”The word λαμπρός (lampros), the adjective meaning "gleaming" or "splendid," is by far the best-known form of this small family and the only one the New Testament uses more than once. It describes anything that catches the eye by giving off or throwing back light: the bright morning star, a river sparkling like crystal, the dazzling white linen of heaven, the shining clothes of an angel, and, at the other end of its range, the expensive clothes of a rich visitor and the luxury goods a doomed city loses. Its matching abstract noun λαμπρότης (lamprotēs) names that gleam on its own, and its matching adverb λαμπρῶς (lamprōs) says a life was lived in that showy style. All three are one word in different forms, so they are studied together under the adjective.
λαμπρῶς“magnificently”The word λαμπρῶς (lamprōs) is the adverb of this family, meaning "in splendid style" or "sumptuously." It appears once, in the parable of the rich man who dressed in purple and fine linen and feasted "in splendor" every day. It says of a way of living what the adjective λαμπρός (lampros) says of a thing, taking up the same showy, expensive shine that word carries when it describes costly clothes and luxury goods, so the λαμπρός entry covers it.