catastrophic

Adjective
US[kat-uh-strof-ik]/ˌkætəˈstrɑfɪk/4 syllables
Synonyms: ruinous

Open English WordNet

Adjective (1)

  1. extremely harmful; bringing physical or financial ruin“a catastrophic depression”“catastrophic illness”“a ruinous course of action”Synonyms: ruinousOpposite harmlessSimilar harmful
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Webster's Dictionary (1913)

Cat′a·stroph′ic adjective

Of a pertaining to a catastrophe. Baden Powell

Webster’s Revised Unabridged Dictionary (1913), from GCIDE 0.54

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