Article: undercover

undercover adjective   1. an undercover operation | undercover behavior synonyms : secret, hidden, concealed, masked, veiled, shrouded, private, confidential, covert, clandestine, underground, surreptitious, furtive, stealthy, sly; inf. hush-hush.
  2. undercover agents synonyms : spying, espionage. antonyms: open; overt.

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