UNDERCOVER

• (adj.) conducted with or marked by hidden aims or methods

  "clandestine intelligence operations", "cloak-and-dagger activities behind enemy lines", "hole-and-corner intrigue", "secret missions", "a secret agent", "secret sales of arms", "surreptitious mobilization of troops", "an undercover investigation", "underground resistance"

  synonyms : clandestine , cloak-and-dagger , hole-and-corner , hugger-mugger , hush-hush , secret , surreptitious , underground

  They were on a clandestine mission. -added by naila_inlas

  
  -tagged by editor1
  guy in black T-Shirt is an undercover agent.

WordNet® 3.0, © 2006 by Princeton University.

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