cataclysmic

cat·a·clysm  (kt-klzm)

n.

1. A violent upheaval that causes great destruction or brings about a fundamental change.

2. A violent and sudden change in the earth's crust.

3. A devastating flood.

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[French cataclysme, from Latin cataclysmos, deluge, from Greek kataklusmos, from katakluzein, to inundate : kata-, intensive pref.; see cata- + kluzein, to wash away.]

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cata·clysmic (-klzmk), cata·clysmal (-klzml) adj.

cata·clysmi·cal·ly adv.

Thesaurus

Adj.

1.

cataclysmic - severely destructive; "cataclysmic nuclear war"; "a cataclysmic earthquake" cataclysmal destructive - causing destruction or much damage; "a policy that is destructive to the economy"; "destructive criticism"

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cataclysmic

adjective disastrous, devastating, catastrophic, calamitous