Adjective: Janus-faced 'jey-nus,feyst
- Having or concerned with polarities or contrasts
"a Janus-faced view of history"; "a Janus-faced policy"
- Having two faces--one looking to the future and one to the past
- 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
See also: bipolar, dishonest, dishonorable [US], dishonourable [Brit, Cdn], faced