How to Say "adversary" in Spanish
The Spanish word for “adversary” is “oponente” — A2 level. This is a very common word in everyday Spanish.
English → SpanishA2
nounA2
a more formal way to describe someone you are against

Examples
Mi oponente en el ajedrez es muy inteligente.
My opponent in chess is very smart.
Los dos oponentes se saludaron antes del partido.
The two opponents greeted each other before the match.
Debemos respetar a nuestro oponente político.
We must respect our political opponent.
One word for both genders
This word stays the same whether you are talking about a man or a woman. To show the gender, just change the word 'the' or 'a' before it: 'el oponente' (the male opponent) or 'la oponente' (the female opponent).
Don't say 'oponenta'
Mistake: “La oponenta.”
Correction: La oponente.
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