Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
disingenuously is an adverb meaning "in a disingenuous manner". It carries one recorded sense.
in a disingenuous manner
“disingenuously, he asked leading questions about his opponent's work”
Definitions, synonyms and semantic relations for disingenuously come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.