How to Say "foe" in Spanish
The Spanish word for “foe” is “enemigo” — A2 level. This is a very common word in everyday Spanish.

Examples
Mi equipo de fútbol tiene un gran enemigo en la final.
My soccer team has a great rival in the final.
No puedes confiar en tu enemigo, debes tener cuidado.
You can't trust your enemy; you must be careful.
Lucharon valientemente contra el enemigo común.
They fought bravely against the common enemy.
Feminine Form
When referring to a female opponent, the word changes to 'enemiga'. Both are nouns: 'El enemigo' (the male enemy) or 'La enemiga' (the female enemy).
The Personal 'a'
If you are talking about seeing or knowing a specific person who is an enemy, you must use the little word 'a' before them: 'Conocí a mi enemigo' (I met my enemy).
Mixing Noun and Adjective
Mistake: “La persona es enemigo.”
Correction: La persona es enemiga. (Remember to match the gender, 'enemiga' for a female person, or 'enemigo' if you mean the team/group is the enemy.)
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