発生 はっせい げん否認 ひにん不能 ふのうでしょう
hasseigenno hinin funōdeshō

Noun
Desu Copula

Expresses probability in a polite manner ("probably…") of 発生源の否認不能

1. Probably the source.; Probably undeniable source.

Polite
Presumptive
Conjecture
Computing