Synonyms and related words :
Janus-like, Machiavellian, ambidextrous, artful, bifacial, bifold, biform, bilateral, binary, binate, biparous, bivalent, calculating, chiseling, collusive, conduplicate, covinous, crafty, crooked, cunning, deceitful, dishonest, disomatous, double, double-dealing, double-faced, double-minded, double-tongued, doublehearted, dual, duple, duplex, duplicate, duplicitous, faithless, FALSE, false-principled, falsehearted, finagling, fraudulent, furtive, geminate, geminated, guileful, indirect, insidious, perfidious, scheming, second, secondary, sharp, shifty, slippery, sneaky, surreptitious, treacherous, trickish, tricky, twin, twinned, two-level, two-ply, two-sided, two-story, twofold, underhand, underhanded, wily