Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
murderously is an adverb meaning "as if bent on murder". It carries 2 recorded senses.
as if bent on murder
“the huge dog bore down on them with bared fangs and barking murderously”
Definitions, synonyms and semantic relations for murderously come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.