Cataclysmic (adjective)

1. Of or relating to a cataclysm, a sudden and violent event that causes great destruction and change.
2. Extremely severe or disastrous.
3. Extremely destructive and violent.

Origin:

Early 19th century: from french cataclysmique, from greek kataklusmos "deluge, upheaval", from kataklyzein "wash down, deluge", from kata- "down" + klyzein "to wash".

Examples:

1. The earthquake was a cataclysmic event that caused widespread destruction.
2. The storm was cataclysmic, causing widespread damage and destruction.
3. The cataclysmic event that changed the course of human history.
4. The cataclysmic war resulted in the destruction of many cities.
5. The cataclysmic volcanic eruption covered the surrounding area with ash and pumice.