Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
decorously is an adverb meaning "in a proper and decorous manner". It carries one recorded sense.
in a proper and decorous manner
“he pretended to be pleased and applauded decorously”
Definitions, synonyms and semantic relations for decorously come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.