Dictionary (a.) Done without proper authority; clandestine; stealthy; as, a surreptitious passage in an old manuscript\; a surreptitious removal of goods.Thesaurus 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 |