deceitful

adj.

[1]	dishonest , fallacious , fraudulent , underhand(ed) , untrustworthy , misleading , crooked , insincere , false , fraudulent , counterfeit , disingenuous , lying , mendacious , untruthful , wily , crafty , sly , cunning , scheming , guileful , artful , sneaky , double-dealing , two-faced , hypocritical , duplicitous , (Colloq) phoney/(US) phony
[2]	ambidextrous , double-dealing , duplicitous , Janus-faced , two-faced , double-faced , double-tongued