FURTIVE

adj. 1 secret, private, secretive, clandestine, surreptitious, stealthy, underhand(ed), covert, hidden, conspiratorial, skulking, deceitful, under the table, under the counter, hugger-mugger, Colloq sneaky She gave me a furtive look to let me know she was on to me 2 sly, foxy, cunning, crafty, wily, shifty, untrustworthy, Colloq sneaky His furtive manoeuvres mark him as one not to be trusted