'Catastrophic' definitions:

Definition of 'catastrophic'

From: WordNet
adjective
Extremely harmful; bringing physical or financial ruin; "a catastrophic depression"; "catastrophic illness"; "a ruinous course of action" [syn: catastrophic, ruinous]

Definition of 'Catastrophic'

From: GCIDE
  • Catastrophic \Cat`a*stroph"ic\, a. Of a pertaining to a catastrophe. --B. Powell. [1913 Webster]