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

Examples
Hay una puerta secreta detrás de la estantería.
There's a secret door behind the bookshelf.
Tuvieron una reunión secreta para discutir el plan.
They had a secret meeting to discuss the plan.
El agente secreto llevaba un micrófono oculto.
The secret agent wore a hidden microphone.
Matching the Noun
When used to describe something, 'secreto' must change its ending to match the noun's gender. Use 'secreto' for masculine things ('un plan secreto') and 'secreta' for feminine things ('una misión secreta').
Forgetting to Change the Ending
Mistake: “Tienen una reunión secreto.”
Correction: Tienen una reunión secreta. (They have a secret meeting.) Because 'reunión' is a feminine word, the adjective describing it must also end in '-a'.
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