Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
unenthusiastically is an adverb meaning "without enthusiasm; showing no enthusiasm". It carries one recorded sense.
without enthusiasm; showing no enthusiasm
“the children opened the presents unenthusiastically”
Definitions, synonyms and semantic relations for unenthusiastically come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. .