1) Abundantly 2) Carelessly 3) Copiously 4) Decadently 5) Dissolutely 6) Improvidently 7) In a rich and lavish manner 8) In a wasteful manner 9) In an abundant manner 10) Inefficiently 11) Lavishly 12) Licentiously 13) Profligately 14) Profusely 15) Recklessly 16) Uneconomically 17) Unrestrainedly 18) Wastefully 1) Abundantly 2) Copiously 3) Lavishly 4) Luxuriously 5) Ostentatiously 6) Profusely 
• (adv.) In an extravagant manner; wildly; excessively; profusely.
Ex·trav'a·gant·ly adverb In an extravagant manner; wildly; excessively; profusely. 
[adv] - in a wasteful manner
lavishly adverb in a wasteful manner; `the United States, up to the 1920s, used fuel lavishly, mainly because it was so cheap`