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Adjective: deceitful  di'seet-ful
  1. Involving deception
    "deceitful advertising"; "smooth, shining, and deceitful as thin ice";
    - fallacious, fraudulent
  2. 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";
    - ambidextrous, double-dealing, duplicitous, Janus-faced, two-faced, double-faced, double-tongued

See also: dishonest, dishonorable [US], dishonourable [Brit, Cdn]

Encyclopedia: Deceitful