furtive Synonyms

backstair sneaky sneak stealthy surreptitious backstairs subterranean subreptitious backroom stealthily suspicious thievish stealthful stealth spoliative shifty sidelong skulking slinking slinky sly slyly sneaking treacherous tricky underground conspiratorial hole-and-corner hush-hush lurky undercover under wraps thievishly under cover cloak-and-dagger furan cagy underhand underhanded underneath wily behind-the-scenes sub-rosa under-the-table low profile under the counter alchemistic covert covinous crafty