1. Having two faces--one looking to the future and one to the past
   - two-faced 
2. Marked by deliberate deceptiveness especially by pretending one set of feelings and acting under the influence of another
   - ambidextrous, deceitful, double-dealing, duplicitous, two-faced, double-faced, double-tongued 
3. Having or concerned with polarities or contrasts
   "a Janus-faced view of history"; "a Janus-faced policy"

See also: bipolar, dishonest, dishonorable [US], dishonourable [Brit, Cdn], faced

• go-to-meeting
• Goa
• goa bean
• goa bean vine
• Goa powder
• goad
• goaded
• goading
• goal
• goal line
• goal-directed
• goal-kick
• goalie
• goalkeeper
• goalless
• goalmouth
• goalpost
• goaltender
• goanna
• goat
• goat antelope
• goat cheese
• goat god
• goat grass
• goat herder