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