11 letters · 20 points in Scrabble
adjective severely destructive
originEtymology tree English cataclysm Proto-Italic *-ālis Latin -ālisbor. Old French -albor. ▲ Latin -ālis Old French -elbor. ▲ Latin -ālisbor. Middle English -al English -al English cataclysmal From cataclysm + -al.
Etymology from Wiktionary, CC BY-SA 3.0