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