Adjective

• 1. having or concerned with polarities or contrasts;

  "a Janus-faced view of history"

  "a Janus-faced policy"

• 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"- Israel Zangwill

  "a double-dealing double agent"

  "a double-faced infernal traitor and schemer"- W.M.Thackeray

• 3. having two faces--one looking to the future and one to the past;

  "Janus the two-faced god"