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