| Surreptitious (a.) Done without proper authority; clandestine; stealthy; as, a surreptitious passage in an old manuscript; a surreptitious removal of goods. Thesaurus Entries artful, back-door, backstairs, calculating, chiseling, clandestine, collusive, concealed, covert, covinous, crafty, cunning, deceitful, doggo, FALSE, falsehearted, feline, finagling, fraudulent, furtive, guileful, hidden, hidden out, hidlings, hole-and-corner, hugger-mugger, hush-hush, in ambush, in hiding, in the wings, indirect, insidious, lurking, on the sly, on tiptoe, private, privy, prowling, pussyfoot, pussyfooted, quiet, scheming, secret, secretive, sharp, shifty, skulking, slinking, slinky, slippery, sly, sneaking, sneaky, stealing, stealthy, treacherous, trickish, tricky, two-faced, under cover, under-the-counter, under-the-table, undercover, underground, underhand, underhanded, unobtrusive, veiled, waiting concealed, wily |