opulent
Meaning: characterized by rich abundance verging on ostentation
Usage: The opulent furnishings of the dictator’s private compound contrasted harshly with the meager accommodations of her subjects.
affluent
Meaning: rich, wealthy
Usage: Mrs. Grebelski was affluent, owning a huge house, three cars, and an island near Maine.
lavish
Meaning: very generous, abundant, or elaborate
Usage: The school held a lavish celebration after the championship win.
exorbitant
Meaning: excessive
Usage: Her exorbitant praise made me blush and squirm in my seat.