lavishly in WordNet English dictionary

1. in a wasteful manner
   "the United States, up to the 1920s, used fuel lavishly, mainly because it was so cheap"
   extravagantly  lavishly  extravagantly  lavishly 
   
2. in a rich and lavish manner
   "lavishly decorated"
   lavishly  richly  extravagantly  lavishly  richly  extravagantly