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say it: kat-uh-KLIZ-mik
cataclysmic is an adjective meaning "severely destructive". It carries one recorded sense.
severely destructive
“cataclysmic nuclear war”
“a cataclysmic earthquake”
Definitions, synonyms and semantic relations for cataclysmic come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.