Where does “unpossibility” come from?
unpossibility (English) comes from English possibility, from Middle English possibilite, from Middle French possibilité, from Old French possibilité, from Latin possibilitās, from Latin possibilis, from Latin -bilis, from Proto-Italic -ðlis — Alternative form of *-trom; instrumental suffix;...
unpossibility (English): Impossibility
Ancestry of “unpossibility”, step by step