The adjective luxurious describes something that is of very high quality or expensive taste, like your luxurious living room filled with the softest rugs and gorgeous furniture hand-crafted in Italy.
In the 14th century, luxurious didn't mean what it does today; it meant "lascivious, lecherous, unchaste." What happened? The invention of bling for one thing, and the rise of a culture that celebrates material pleasures. Today, luxurious translates as exclusive, comfortable, expensive and superior in quality, like a luxurious home featured in a magazine about rich people and their favorite things.