infiltré

/ɛ̃.fil.tʁe/infiltrer
1.
nounmasculine

undercover agent

mole

plant (someone placed inside a group)

Un infiltré nous a fourni des preuves.

An infiltrator (a mole) gave us evidence.

2.
adjective

infiltrated

penetrated

permeated (e.g., by a liquid or by people introduced secretly)

Le réseau a été infiltré par des agents ennemis.

The network was infiltrated by enemy agents.