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

Examples
Mis zapatos están muy sucios después de caminar en el parque.
My shoes are very dirty after walking in the park.
Necesitas cambiarte; toda tu ropa está sucia.
You need to change; all your clothes are dirty.
El suelo de la cocina estaba sucio con migas y grasa.
The kitchen floor was dirty with crumbs and grease.
Adjective Agreement
Since 'sucio' describes nouns, its ending must match the noun. Use 'sucio' (masculine singular), 'sucia' (feminine singular), 'sucios' (masculine plural), or 'sucias' (feminine plural).
Forgetting Gender Agreement
Mistake: “La camisa es sucio.”
Correction: La camisa es sucia. (Always match the adjective to the noun's gender, 'camisa' is feminine.)
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