covert Synonyms

hidden concealed private secret disguised clandestine stealthy cover masked surreptitious camouflaged concealment undercover unseen screen secretive veiled underground wildwood woodland thicket unnoticed ulterior underhand ultraviolet underbrush silent underneath underhanded undergrow undergrowth tertiary tented surrey sneaky sneaking smouldering slinking skulking sideways sidelong shrubbery speculum spinney subversive subtle subterrestrial subterraneous subterranean stealthful