artful, calculating, crafty, deceitful, deceptive, delusive, delusory, dishonest, disingenuous, equivocal, false, falsehearted, forsworn, inaccurate, incorrect, insincere, knavish, lying, mendacious, misleading, perjured, prevaricating, roguish, scheming, shifty, truthless, uncandid, unfrank, unsincere, unveracious, wrong

For further exploring for "untruthful" in Webster Dictionary Online

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