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