Crossword Genius

Very antiquated — invalidate UN (anag) (12)

Ross

I believe the answer is:

antediluvian

(Other definitions for antediluvian that I've seen before include "before the water's bubbled up" , "Very old (before the Flood)" , "Before the flood; ancient" , "Very old-fashioned (from before the Flood?)" .)

I've seen this clue in The Guardian.
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