Where does “sennonché” come from?

sennonché (Italian) comes from Italian sé, from Italian benché, from Italian bene, from Latin bene, from Latin bonus, from Old Latin duenos, from Proto-Italic dwenos, from Proto-Indo-European dew- — to show favour, revere; to fail, to lag, to be...

Ancestry of “sennonché”, step by step

sennonché traces back through 3 separate lines of ancestry.

via Italian

StepLanguageWordMeaning
1Italianoneself, himself, herself
2Italianbenchéalthough, though; albeit
3Italianbeneupper-class, posh, high; well, nicely, OK, right;...
4Latinbenewell; properly, exactly; agreeably, favorably
5Latinbonusgood, honest, brave, noble, kind, pleasant;...
6Old LatinduenosAlternative form of duonus
7Proto-Italicdwenosgood
8Proto-Indo-Europeandew-to show favour, revere; to fail, to lag, to be...

via Italian non

StepLanguageWordMeaning
1Italiannonnot; un-; don't
2Latinnōnnot
3Old Latinnoenum
4Proto-Indo-Europeanóynosone; single

via Italian ché

StepLanguageWordMeaning
1ItalianchéClipping of perché., comparable to 'cause in...
2Latinquodnominative neuter singular of quī; accusative...
3Proto-Indo-Europeankʷódwhat
4Proto-Indo-Europeankʷóswho
Every word from Proto-Indo-European dew-Every word from Proto-Italic dwenosEvery word from Old Latin duenos