Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
distastefully is an adverb meaning "in an offensively distasteful manner". It carries 2 recorded senses.
in an offensively distasteful manner
“a distastefully explicit report on the Royal couple's marital life”
in a disgusting manner or to a disgusting degree
“the beggar was disgustingly filthy”
Definitions, synonyms and semantic relations for distastefully come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.