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