Where does “two-facedness” come from?

two-facedness (English) comes from English two-faced, from English two, from Middle English two, from Old English twā, from Old English twēġen, from Proto-West Germanic twai-, from Proto-Germanic twai, from Proto-Indo-European dwóh₁ — two.

two-facedness (English): The quality of being two-faced

Definitions

  1. The quality of being two-faced

Ancestry of “two-facedness”, step by step

two-facedness traces back through two separate lines of ancestry.

via English two-faced

StepLanguageWordMeaning
1Englishtwo-facedhaving two faces or plane surfaces; deceitful,...
2EnglishtwoA numerical value equal to 2; this many dots;...
3Middle Englishtwotwo
4Old Englishtwātwo
5Old Englishtwēġentwo; twain
6Proto-West Germanictwai-two
7Proto-Germanictwaitwo
8Proto-Indo-Europeandwóh₁two

via English Ness

StepLanguageWordMeaning
1EnglishNessAn Ulster princess and the mother of Conchobar mac Nessa and Findchoem in the Ulster Cycle of Irish mythology. Daughter of Eochaid Sálbuide. Also the mother of Cormac Cond Longas by incest with Conchobar mac Nessa
2Middle Englishnesse
3Old Englishnæsnot, not at all; not; first/third-person singular...
4Proto-Germanicnasjąfoothill; headland; cape
5Proto-Indo-Europeannéh₂snose
Every word from Proto-Indo-European dwóh₁