Byzantine, Machiavellian, Machiavellic, acute, arch, artful, astute, cagey, calculating, canny, careful, cautious, circumspect, clever, crafty, cunning, cute, deceitful, deep-laid, deep, deliberate, designing, devious, difficult, diplomatic, discreet, feline, finical, finicking, finicky, finikin, foxy, fuss-budgety, fussy, gingerly, guarded, guileful, hard to please, heedful, hesitant, ingenious, insidious, inventive, judicious, knowing, leaving out nothing, mindful, noncommittal, on guard, overlooking no possibility, pernickety, persnickety, politic, prudent, queasy, ready, regardful, resourceful, safe, scheming, serpentine, sharp, shifty, shrewd, slick, slippery, slow to act, sly, smooth, snaky, sneaky, sophistical, squeamish, stealthy, strategic, subtile, subtle, supple, tactical, tentative, thorough, trickish, tricksy, tricky, unadventurous, uncommunicative, undaring, unenterprising, unprecipitate, vulpine, wary, wily