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Adjective: Janus-faced  'jey-nus,feyst
  1. Having two faces--one looking to the future and one to the past
    - two-faced
  2. Marked by deliberate deceptiveness especially by pretending one set of feelings and acting under the influence of another
    "she was a Janus-faced scheming little thing";
    - ambidextrous, deceitful, double-dealing, duplicitous, two-faced, double-faced, double-tongued
  3. Having or concerned with polarities or contrasts
    "a Janus-faced view of history"; "a Janus-faced policy"

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