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Adjective: double-faced  'dú-bul'feyst
  1. Marked by deliberate deceptiveness especially by pretending one set of feelings and acting under the influence of another
    "a double-faced infernal traitor and schemer";
    - ambidextrous, deceitful, double-dealing, duplicitous, Janus-faced, two-faced, double-tongued
     
  2. (of fabrics) having faces on both sides
    "damask is a double-faced fabric"

See also: dishonest, dishonorable [US], dishonourable [Brit, Cdn], reversible, two-sided