Synonyms and Antonyms of undercover
undertaken or done so as to escape being observed or known by others
- an undercover operation to infiltrate the criminal organization
backstairs, behind-the-scenes, clandestine, covert, furtive, hugger-mugger, hush-hush, private, privy, secret, sneak, sneaking, sneaky, stealth, stealthy, surreptitious, underground, underhand, underhanded
aboveboard, straightforward, unconcealed, undisguised
clear, evident, manifest, obvious, patent, plain
working on missions in which one's objectives, activities, or true identity are not publicly revealed
- For months she's been an undercover agent pretending to be a stock broker.