1) Extravagantly 2) Incompetently 3) Prodigally 4) Profligately 1) Prodigally 
[adv] - to a wasteful manner or to a wasteful degree
wastefully 1. A reference to a wasteful manner or to a wasteful degree. 2. Wasted in a lavish manner; with prodigality; or with useless expenses or consumptions. 3. Given to or marked by waste.
adverb to a wasteful manner or to a wasteful degree; `we are still prodigally rich compared to others`