1. (adj)Janus-faced having or concerned with polarities or contrasts
"a Janus-faced view of history"; "a Janus-faced policy"
2. (adj)ambidextrous, deceitful, double-dealing, duplicitous, Janus-faced, two-faced, double-faced, double-tongued 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. (adj)Janus-faced, two-faced having two faces--one looking to the future and one to the past
"Janus the two-faced god"