Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
surpassingly is an adverb meaning "to an extraordinary degree". It carries one recorded sense.
to an extraordinary degree
“she was a surpassingly beautiful woman”
“I will mention only one particular aspect of the current mess because ... this one is surely something new and passing strange”
Definitions, synonyms and semantic relations for surpassingly come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.