In a prodigal manner; extravagantly or wastefully.(adverb)
Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License
Use "prodigally" in a sentence
"They early discovered the virtues of hot water judiciously saturated with sugar, and they prodigally swam their flapjacks and soaked their crusts in the rich, white syrup."
"And Tom King, who for half an hour had conserved his strength, now expended it prodigally in the one great effort he knew he had in him."
"At still other times, his tactics would be to scatter single chips prodigally and amazingly over the table."