cataclysmal

Lyall in England had shown that geological formations were evolutionary rather than cataclysmal.

From Browning and His Century by Helen Archibald Clarke

Fortunately, the approaching explosion, which would have been of a cataclysmal nature,—Stiffy was not a boy to do things by halves,—was averted by a change of demeanour on the part of the temptress.

From A Safety Match by Ian Hay

The mind trained in submission to universal law will not shrink from a fate which awaits the universe by fire or cataclysmal change.

From Roman Society from Nero to Marcus Aurelius by Samuel Dill

Miss Quincey was quite shaken by this cataclysmal outbreak, this overturning and shattering of the old beacons and landmarks.

From Superseded by May Sinclair

Nothing short of the cataclysmal end of the world could have provided drama to match the stupendous stage-setting of that stormy sky.

From October Vagabonds by Richard Le Gallienne