the.com/foe
An enemy in a nicer outfit, dressed for poetry instead of a fistfight.
means A personal or hostile opponent — someone who opposes or seeks to harm you.
from From Old English fah, meaning hostile or at feud, tracing to roots of fighting and feuding.
Friend's foilSurvives mostly in the phrase friend or foe
Old grudgeShares deep roots with the word feud
Poet's pickBeloved by writers for rhyming neatly with woe