furtive Synonyms

sneak stealthy sneaky backstair backstairs surreptitious subterranean thievish stealthily stealth spoliative subreptitious secretive shifty sidelong skulking slinking slinky sly slyly sneaking treacherous tricky furan cloak-and-dagger conspiratorial hole-and-corner hush-hush undercover thievishly under cover cagy low profile underground underhand underhanded underneath wily behind-the-scenes sub-rosa under-the-table under wraps secret scheming covinous crafty cunning deceitful dern devious