delusory

artful, crafty, cunning, devious, foxy, guileful, shady, shifty, slick, sly, sneaking, sneaky, subtile, subtle, trick, trickish, tricky, underhand, underhanded, wily

crooked, defrauding, dishonest, dissembling, double-dealing, duplicitous, faithless, fast, fraudulent, knavish, lying, mendacious, untrustworthy, untruthful

bogus, counterfeit, fake, feigned, forged, phony (also phoney), sham, spurious

insidious, perfidious, treacherous

artificial, backhanded, hypocritical, insincere, left-handed, two-faced