How to Say "the opposite" in Spanish
The most common Spanish word for “the opposite” is “contrario” — use 'contrario' when referring to the opposite concept, outcome, or result, often implying a contrast or reversal of expectations..
contrario
/kon-TRAH-ree-oh//konˈtɾa.ɾjo/

Examples
Pensé que llovería, pero ocurrió todo lo contrario.
I thought it would rain, but quite the opposite happened.
¿Es bueno o malo? Depende del contrario.
Is it good or bad? It depends on the opposite (situation).
No estoy de acuerdo. Al contrario, creo que deberíamos esperar.
I don't agree. On the contrary, I think we should wait.
Fixed Phrases
When used in the common fixed phrases like 'al contrario' and 'por el contrario,' 'contrario' acts like an adverb, modifying the whole sentence to introduce a contrast.
Misusing 'On the Contrary'
Mistake: “Using 'en contrario' to mean 'on the contrary.'”
Correction: Always use 'al contrario' or 'por el contrario.' The article 'el' is necessary.
opuesto
oh-PWEH-stoh/oˈpwesto/

Examples
Él es justo lo opuesto a su hermano.
He is just the opposite of his brother.
Sucedió todo lo opuesto.
The exact opposite happened.
Contrario vs. Opuesto
Related Translations
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