1 synonym for Covert

secret, covert, furtive, surreptitious, stealthy, hidden, underground, concealed, undercover, private, hush-hush, sneaky, cloaked, veiled, shrouded, backdoor, underhand, sub-rosa, low-key, confidential, unacknowledged, unpublicized, unannounced, undisclosed, unobserved, unrecorded, unreported, unspoken, unwritten, camouflaged, masked, shadowy, obscure, cryptic, arcane, esoteric, mystic, enigmatic, stealth, sly, sneaking, privy [x]