Where does “nonexcusable” come from?
nonexcusable (English) comes from English excusable, from Old French escusable, from Latin excusabilis, from Latin -bilis, from Proto-Italic -ðlis, from Proto-Indo-European -dʰlis, from Proto-Indo-European -dʰlom — Alternative form of *-trom; instrumental suffix;...
nonexcusable (English): Not excusable
Ancestry of “nonexcusable”, step by step