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cataclysmic

or cat·a·clys·mal

[kat-uh-kliz-mik]
adjective
  1. of, relating to, or resulting from a cataclysm.
  2. of the nature of, or having the effect of, a cataclysm: cataclysmic changes.
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Origin of cataclysmic

First recorded in 1850–55; cataclysm + -ic
Related formscat·a·clys·mi·cal·ly, adverbnon·cat·a·clys·mal, adjectivenon·cat·a·clys·mic, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Word Origin and History for cataclysmically

cataclysmic

adj.

1837, from cataclysm + -ic. Related: Cataclysmical (1857); cataclysmically.

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Online Etymology Dictionary, © 2010 Douglas Harper