1) Copiously 2) Expensively 3) Extravagantly 4) Grandly 5) In a rich and lavish manner 6) In a wasteful manner 7) Magnificently 8) Opulently 9) Splendidly 10) Sumptuously 11) With extravagance 1) Elaborately 2) Extravagantly 3) Luxuriously 4) Prodigally 5) Profligately 
• (adv.) In a lavish manner.
Lav'ish·ly adverb In a lavish manner. 
[adv] - in a rich and lavish manner
lavishly 1. In a rich and lavish manner. 2. With profuse expense; prodigally; wastefully. 3. Spending or giving freely and in large amounts, often to excess; extravagant.
adverb in a rich and lavish manner; `lavishly decorated`