undercover agent

Thesaurus

Noun

1.

undercover agent - (military) a secret agent hired by a state to obtain information about its enemies or by a business to obtain industrial secrets from competitors spy armed forces, armed services, military, military machine, war machine - the military forces of a nation; "their military is the largest in the region"; "the military machine is the same one we faced in 1991 but now it is weaker" counterspy, mole - a spy who works against enemy espionage double agent - a spy who works for two mutually antagonistic countries espionage agent - someone employed to spy on another country or business competitor foreign agent - a spy for a foreign country infiltrator - someone who takes up a position surreptitiously for the purpose of espionage intelligence agent, intelligence officer, operative, secret agent - a person secretly employed in espionage for a government sleeper - a spy or saboteur or terrorist planted in an enemy country who lives there as a law-abiding citizen until activated by a prearranged signal