Syllable division and stress derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
unconcernedly is an adverb meaning "in an unconcerned manner". It carries one recorded sense.
in an unconcerned manner
“war was breaking out in Europe, but she unconcernedly planned for a holiday”
Definitions, synonyms and semantic relations for unconcernedly come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.