Enter a clue or pattern or both:
The Clue
Unbeatable rival (7 letter answer)
The Answer
NEMESIS
Tags
Notes
The answer NEMESIS is uncommon, appearing about once every 575 puzzles.
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Unbeatable foe
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Bête noire's relative
Goddess of righteous anger
Greek goddess of vengeance
1989 Isaac Asimov book
Very tough thing to lick
Definition
NEMESIS as a noun:
1. (Greek mythology) the goddess of divine retribution and vengeance
2. (bane, curse, scourge, nemesis) = something causes misery or death; "the bane of my life"