Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
inoffensively is an adverb meaning "in a not unpleasantly offensive manner". It carries one recorded sense.
in a not unpleasantly offensive manner
“that wretched beast, the elephant, breathing inoffensively not a pace behind me”
Definitions, synonyms and semantic relations for inoffensively come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. .