How to Say "sour" in Spanish
The most common Spanish word for “sour” is “agrio” — use 'agrio' for the common sour taste associated with fruits like lemons, limes, or unripe fruit, or for fermented foods..
agrio
/ah-gree-oh//ˈa.ɣɾjo/

Examples
No me gusta este limón porque es muy agrio.
I don't like this lemon because it is very sour.
Huele la leche; creo que está agria.
Smell the milk; I think it is spoiled.
Las manzanas verdes tienen un sabor agrio que me encanta.
Green apples have a tart taste that I love.
Using 'Ser' vs 'Estar'
Use 'ser' when a food is naturally sour (like a lemon). Use 'estar' when food has turned sour because it's gone bad (like milk).
Matching Gender
Remember to change the ending to 'agria' if you are describing a word that is feminine, like 'la manzana' (the apple) or 'la leche' (the milk).
Agrio vs. Amargo
Mistake: “El café sin azúcar es muy agrio.”
Correction: El café sin azúcar es muy amargo.
ácido
Examples
El limón es demasiado ácido para comerlo solo.
The lemon is too sour to eat by itself.
acre
/ah-kreh//ˈa.kɾe/

Examples
Había un olor acre a humo en la habitación.
There was an acrid smell of smoke in the room.
Su respuesta fue acre y llena de resentimiento.
His answer was biting and full of resentment.
El sabor acre de la fruta verde no me gustó.
I didn't like the sharp, sour taste of the green fruit.
One form for both
This adjective ends in 'e', which means it stays the same whether the noun is masculine or feminine (e.g., 'un olor acre', 'una respuesta acre').
Gender confusion
Mistake: “Changing it to 'acra' for feminine nouns.”
Correction: Keep it as 'acre' for both 'el' and 'la' nouns.
Agrio vs. Ácido
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