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

Examples
El equipo ya está clasificado para la final.
The team is already qualified for the final.
No puedes leer ese documento; es información clasificada.
You cannot read that document; it is classified information.
Tengo mis correos clasificados por fecha.
I have my emails sorted by date.
Matching the Noun
Since this is an adjective, its ending changes to match what you are describing. Use 'clasificado' for masculine things (el archivo) and 'clasificada' for feminine things (la carta).
Use with 'Estar'
When talking about a team reaching a final or a document being secret, we usually use the verb 'estar' because it describes a current state or result.
Qualified vs. Clasificado
Mistake: “In sports, using 'cualificado' for a team passing to the next round.”
Correction: Use 'clasificado' for sports results. 'Cualificado' is usually for job skills or being 'qualified' for a profession.
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