Definition of undercover:
Synonyms for undercover:
hugger-mugger, stealth, sneaky, secretive, private, behind-the-scenes, classified, underground, shadowy, in strict confidence, show, secret, sneaking, confidential, privy, stealthy, covert, mysterious, cloak-and-dagger, sneak, under wraps, backstairs, huggermugger, clandestine, hush-hush, surreptitious, on the quiet, furtive, sub rosa, hole-and-corner, underhand, underhanded.
- "Legacy", James H Schmitz.
- "The Rise of the Dutch Republic, 1563-64", John Lothrop Motley.
Then you undoubtedly found out that though Sarah Pollitt and friend Bergmann knew each other well at one time she dropped him like a hot cake when he suggested she do a little undercover work for the Commies.- "The Last Straw", William J. Smith.