Bugger my brain has gone to jelly on this one.

Help, I need it as a one word translation - Feared Opponent doesn't have the impact.

Would Nemesis or Archrival do just as well? I'm using it in a sporting context by the way...

thanks in advance

http://www.babylon.com/definition/Angstgegner/English

"adversary"?

ta that will do nicely sir!