How to Say "thorough" in Spanish
The Spanish word for “thorough” is “cuidadoso” — A2 level. This is a very common word in everyday Spanish.

Examples
Mi abuelo es muy cuidadoso con sus herramientas de jardín.
My grandfather is very careful with his garden tools.
Ella fue cuidadosa al hablar para no ofender a nadie.
She was cautious when speaking so as not to offend anyone.
El informe del arquitecto fue muy cuidadoso y detallado.
The architect's report was very thorough and detailed.
Adjective Agreement
Since 'cuidadoso' describes a person or thing, its ending must change to match the gender and number: 'cuidadoso' (masculine singular), 'cuidadosa' (feminine singular), 'cuidadosos' (masculine plural), and 'cuidadosas' (feminine plural).
Confusing Adjective and Adverb
Mistake: “Using 'cuidadoso' to describe how an action is done (e.g., 'Ella conduce cuidadoso').”
Correction: Use the adverb 'cuidadosamente' to describe the action: 'Ella conduce cuidadosamente' (She drives carefully).
Related Translations
Learn Spanish with Inklingo
Interactive stories, personalized learning, and more.