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

Examples
Las cifras oficiales de ventas se publicarán mañana.
The official sales figures will be published tomorrow.
Tuvimos que seguir las reglas oficiales del concurso.
We had to follow the official rules of the competition.
Los idiomas oficiales de Canadá son el inglés y el francés.
The official languages of Canada are English and French.
Adjective Agreement
As an adjective, 'oficiales' is plural and must match the plural noun it describes. It works for both masculine nouns (documentos oficiales) and feminine nouns (reglas oficiales).
Using the singular form
Mistake: “Los datos oficial son incorrectos.”
Correction: Los datos oficiales son incorrectos. (The plural ending is needed because 'datos' is plural.)
Related Translations
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