Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
unpropitiously is an adverb meaning "in an inauspicious manner". It carries one recorded sense.
in an inauspicious manner
“he started his new job inauspiciously on Friday the 13th”
Definitions, synonyms and semantic relations for unpropitiously come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.