This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

adj. As destructive as a cataclysm.

adj. Of or pertaining to a cataclysm.

Of, pertaining to, or of the nature of a cataclysm.

Of or pertaining to cataclysmists; holding the doctrine of violent upheavals: as, the cataclysmal school of geologists.

adj. severely destructive

"The belief belongs to what may be called the cataclysmal theory of progress, which improves the world by sudden starts, and clings so fondly to liquor-laws, and has profound faith in specific remedies for moral and political diseases."

destructive    cataclysmic   

cataclysmic