janus-faced

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"