How to Say "unsweetened" in Spanish
The Spanish word for “unsweetened” is “seco” — B2 level.
English → SpanishB2
AdjectiveB2
of food or drinks

Examples
Quiero una copa de cava, pero tiene que ser brut seco.
I want a glass of sparkling wine, but it must be brut dry.
El pastel estaba demasiado seco, le faltaba crema.
The cake was too dry; it lacked cream.
Taste vs. Texture
When describing wine, 'seco' means it lacks sugar (taste). When describing baked goods (like bread or cake), it means it lacks moisture (texture).
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