Also means
undercover
Usage Note
Infiltrado is the past participle of infiltrar used as an adjective or noun. As a noun, un infiltrado means an undercover agent or spy who has entered an organisation. The feminine is infiltrada. It is common in political and journalistic language (agente infiltrado, undercover agent).
Examples
"El agente infiltrado grabó la reunión secreta."
Natural Translation
The undercover agent recorded the secret meeting.

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