cataclysmal

listen to the pronunciation of cataclysmal
الإنجليزية - التركية
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الإنجليزية - الإنجليزية
As destructive as a cataclysm

That they have been exterminated by exceptional cataclysmal changes of the earth's surface has not been proved.

Of or pertaining to a cataclysm
{s} disastrous, catastrophic, dreadful; pertaining to a natural disaster
severely destructive; "cataclysmic nuclear war"; "a cataclysmic earthquake