Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
musingly is an adverb meaning "in a reflective manner". It carries one recorded sense.
in a reflective manner
“`It's funny about that bar,' he said musingly”
Definitions, synonyms and semantic relations for musingly come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.