Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
wastefully is an adverb meaning "to a wasteful manner or to a wasteful degree". It carries one recorded sense.
to a wasteful manner or to a wasteful degree
“we are still prodigally rich compared to others”
Definitions, synonyms and semantic relations for wastefully come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. .