How to Say "uncouth" in Spanish
The Spanish word for “uncouth” is “rudo” — B1 level. This is a very common word in everyday Spanish.

Examples
Su lenguaje era muy rudo y ofendió a varios invitados.
His language was very crude and offended several guests.
La tela de la chaqueta se siente ruda y pica.
The jacket fabric feels rough and itchy.
El trato que recibió fue rudo e injusto.
The treatment he received was harsh and unfair.
Agreement
Since 'rudo' is an adjective, it must change its ending to match the noun it describes: 'ruda' (feminine singular), 'rudos' (masculine plural), 'rudas' (feminine plural).
Rudo vs. Grosero
Mistake: “Using 'rudo' when you strictly mean 'impolite' or 'disrespectful' in a social setting.”
Correction: While 'rudo' works, 'grosero' is often the better choice for describing someone who is simply rude or ill-mannered in a social context. 'Rudo' often implies a lack of refinement or physical roughness.
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