Synonyms and related words :
Herculean, Machiavellian, Machiavellic, abstruse, acute, ambidextrous, amoral, arch, arduous, artful, astute, awkward, beguiling, brutal, cagey, calculating, canny, catchy, cheating, chiseling, clever, collusive, complex, complicated, conscienceless, corrupt, corrupted, covinous, crafty, criminal, critical, crooked, cunning, cute, dark, debatable, deceitful, deceiving, deceptive, deep, deep-laid, delicate, delusive, delusory, demanding, designing, devious, difficile, difficult, diplomatic, dishonest, dishonorable, double, double-dealing, doubtful, dubious, duplicitous, evasive, exacting, fallacious, FALSE, falsehearted, feline, felonious, finagling, fishy, formidable, foxy, fraudulent, furtive, guileful, hairy, hallucinatory, hard, hard-earned, hard-fought, hazardous, iffy, ill-got, ill-gotten, illusive, illusory, immoral, indirect, ingenious, insidious, intricate, inventive, jawbreaking, knotted, knotty, knowing, laborious, mean, misleading, no picnic, not easy, not kosher, operose, pawky, perfidious, playful, politic, prankish, pranksome, pranky, precarious, questionable, quirky, ready, resourceful, rigorous, risky, rocky, roguish, rotten, rough, rugged, scheming, sensitive, serpentine, set with thorns, severe, shady, shameless, sharp, shifty, shrewd, sinister, slick, slippery, sly, smooth, snaky, sneaky, sophistical, spiny, sportive, stealthy, steep, sticky, strategic, strenuous, subtile, subtle, supple, surreptitious, suspicious, tactical, thorny, ticklish, toilsome, touch-and-go, touchy, tough, treacherous, trick, trickish, tricksy, two-faced, uncertain, unconscienced, unconscientious, unconscionable, undependable, underhand, underhanded, unethical, unfair, unjust, unprincipled, unsavory, unscrupulous, unsportsmanlike, unstraightforward, uphill, vulpine, waggish, wary, wicked, wily, without remorse, without shame