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

Examples
La mayor desventaja de vivir en la ciudad es el ruido.
The biggest disadvantage of living in the city is the noise.
Nuestro equipo empezó el partido con una clara desventaja.
Our team started the game with a clear disadvantage.
Debemos analizar las ventajas y desventajas antes de comprar la casa.
We must analyze the pros and cons before buying the house.
The 'des-' trick
In Spanish, adding 'des-' to the beginning of a word usually flips it to the opposite meaning. Since 'ventaja' is 'advantage,' adding 'des-' gives you 'disadvantage.'
Always Feminine
This word is always feminine. Even if you are talking about a man who is at a disadvantage, you still use 'la' or 'una' because the word itself doesn't change gender.
Using 'el' instead of 'la'
Mistake: “El desventaja de este plan...”
Correction: La desventaja de este plan... (Because nouns ending in -a are almost always feminine in Spanish).
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