Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
unsuspectingly is an adverb meaning "without suspicions". It carries one recorded sense.
without suspicions
“he was sitting unsuspectingly beyond that wall only a few yards from the burglar”
Definitions, synonyms and semantic relations for unsuspectingly come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.