cataclysmal

from WordNet (r) 3.0 (2006)

cataclysmal
    adj 1: severely destructive; "cataclysmic nuclear war"; "a
           cataclysmic earthquake" [syn: {cataclysmal},
           {cataclysmic}]

from The Collaborative International Dictionary of English v.0.48

Cataclysmal \Cat`a*clys"mal\, Cataclysmic \Cat`a*clys"mic\, a.
   Of or pertaining to a cataclysm.
   [1913 Webster]

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