(a.) Fraudulent; cheating; insincere\; serving to mislead or ensnare; trickish.

Machiavellian Machiavellic acute ambidextrous arch artful astute cagey calculating canny chiseling clandestine clever collusive counterfeit covinous crafty crooked cunning cute deceptive deep deep-laid delusive delusory designing diplomatic dishonest disingenuous double double-dealing double-faced double-minded double-tongued doublehearted duplicitous faithless FALSE false-principled falsehearted feline finagling forsworn foxy fraudulent furtive guileful hypocritical indirect ingenious insidious insincere inventive knavish knowing lying mendacious misleading pawky perfidious perjured politic ready resourceful roguish scheming serpentine sharp shifty shrewd slick slippery sly smooth snaky sneaky sophistical stealthy strategic subtile subtle supple surreptitious tactical treacherous trickish tricksy tricky two-faced uncandid underhand underhanded unfrank unsincere untrustworthy untruthful vulpine wary wily