intended to deceive; "deceitful advertising"; "fallacious testimony"; "smooth, shining, and deceitful as thin ice" - S T Coleridge; "a fraudulent scheme to escape paying taxes"
marked by deliberate deceptiveness especially by pretending one set of feelings and acting under the influence of another; "she was a deceitful scheming little thing"- Israel Zangwill; "a double-dealing double agent"; "a double-faced infernal traitor and schemer"- W M Thackeray
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. The ambassador called the report deceitful and misleading. someone who is deceitful tells lies in order to get what they want