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