Crossword Genius

Seemingly unbeatable foe (7)

Ross

I believe the answer is:

nemesis

(Other definitions for nemesis that I've seen before include "Agent of (someone's) downfall" , "opponent you can't beat" , "Something causing misery (or death) - Meissen (anag)" , "Retributive justice" , "Fate" .)

I've seen this clue in the LA Times.
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