How to Say "undercover" in Spanish
The Spanish word for “undercover” is “encubierto” — B1 level. This is a very common word in everyday Spanish.
English → SpanishB1
adjectiveB1
referring to secret police or investigative work

Examples
El detective trabajó de forma encubierta durante seis meses.
The detective worked undercover for six months.
Llevaron a cabo una operación encubierta para atrapar a los ladrones.
They carried out an undercover operation to catch the thieves.
Matching Gender and Number
Since this word describes a person or thing, it must match. Use 'encubierto' for a man or masculine object, and 'encubierta' for a woman or feminine object.
Using 'escondido' vs 'encubierto'
Mistake: “Using 'escondido' to describe a spy.”
Correction: Use 'encubierto' for people with secret identities. 'Escondido' just means physically hiding behind a curtain or under a bed.
Related Translations
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