Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
entertainingly is an adverb meaning "in an entertaining manner". It carries one recorded sense.
in an entertaining manner
“Byron's consumed memoirs possessed the merit of being well and entertainingly written”
Definitions, synonyms and semantic relations for entertainingly come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.