cataclysmic

[ kat-uh-kliz-mik ]

/ ˌkæt əˈklɪz mɪk /

of, relating to, or resulting from a cataclysm.

of the nature of, or having the effect of, a cataclysm: cataclysmic changes.

Origin of cataclysmic

First recorded in 1850–55; cataclysm + -ic

cat·a·clys·mi·cal·ly, adverb non·cat·a·clys·mal, adjective non·cat·a·clys·mic, adjective

So the worship which many render to the unexplained, the fantastic, the cataclysmal—this is the awe that is born of ignorance.

The Story of the Mind |James Mark Baldwin
It is, in fact, nothing but one cataclysmal bang and shriek of shells and shrapnel.

A Woman's Experience in the Great War |Louise Mack
Very rarely is there a spate, an upheaval, and a cataclysmal sweep that bursts the ice and ends its reign in an hour or two.

Rolf In The Woods |Ernest Thompson Seton
"I'm ———," said Sir John Gotch, meditating some cataclysmal expletive.

The Wonderful Visit |Herbert George Wells

Ten seconds later this cataclysmal lunatic had reverted to sanity—a rather sheepish sanity.

The Secret Places of the Heart |H. G. Wells