How to Say "slacks" in Spanish
The Spanish word for “slacks” is “pantalón” — A1 level. This is a very common word in everyday Spanish.

Examples
Tengo un pantalón azul muy cómodo.
I have a pair of very comfortable blue pants.
Este pantalón me queda un poco grande de la cintura.
These pants are a bit big on me at the waist.
Necesitas un pantalón oscuro para la entrevista de trabajo.
You need dark trousers for the job interview.
Singular vs. Plural for one item
In Spanish, you can use the singular 'el pantalón' or the plural 'los pantalones' to refer to a single pair of pants. Both are perfectly correct!
Gender and Matching
This is a masculine word. Any describing words (adjectives) should end in 'o', like 'pantalón negro' (black pants).
The 'Pair' Confusion
Mistake: “Un par de pantalón.”
Correction: Un pantalón OR Un par de pantalones.
Gender Mix-up
Mistake: “La pantalón.”
Correction: El pantalón.
Related Translations
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