How to Say "impolite" in Spanish
The Spanish word for “impolite” is “grosero” — B1 level. This is a very common word in everyday Spanish.
English → SpanishB1
AdjectiveB1
manners

Examples
Fue muy grosero al no saludar a la dueña de casa.
He was very rude for not greeting the hostess.
No uses lenguaje grosero delante de los niños.
Don't use vulgar language in front of the children.
Gender Agreement
As an adjective, 'grosero' must match the person or thing it describes. Use 'grosero' for masculine (el hombre grosero) and 'grosera' for feminine (la mujer grosera).
Using 'Estar' instead of 'Ser'
Mistake: “Él está grosero.”
Correction: Él es grosero. (Rudeness is usually considered a characteristic or personality trait, so we use 'ser'.)
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