Princeton's WordNet

1. deceitful, fallacious, fraudulent(adj)

   intended to deceive

   "deceitful advertising"; "fallacious testimony"; "smooth, shining, and deceitful as thin ice" - S.T.Coleridge; "a fraudulent scheme to escape paying taxes"

2. ambidextrous, deceitful, double-dealing, duplicitous, Janus-faced, two-faced, double-faced, double-tongued(adj)

   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

Wiktionary

1. deceitful(Adjective)

   deliberately misleading or cheating

2. deceitful(Adjective)

   deceptive in multiple ways

Webster Dictionary

1. Deceitful(adj)

   full of, or characterized by, deceit; serving to mislead or insnare; trickish; fraudulent; cheating; insincere

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