Janus-faced (Adjective) — Marked by deliberate deceptiveness especially by pretending one set of feelings and acting under the influence of another. ex. "she was a Janus-faced scheming little thing"
Janus-faced (Adjective) — Having two faces--one looking to the future and one to the past.
Janus-faced (Adjective) — Having or concerned with polarities or contrasts. ex. "a Janus-faced view of history" ex. "a Janus-faced policy"