artful — If you describe someone as artful, you mean that they are clever and skilful at achieving what they want, especially by deceiving people.
disingenuous — lacking in frankness, candor, or sincerity; falsely or hypocritically ingenuous; insincere: Her excuse was rather disingenuous.
adj ingenuous
deceitful — If you say that someone is deceitful, you mean that they behave in a dishonest way by making other people believe something that is not true.
dishonest — not honest; disposed to lie, cheat, or steal; not worthy of trust or belief: a dishonest person.
