致死 ちし せい家族 かぞく せい不眠 ふみん しょうでしょう
chi shiseika zokuseifumin shōdeshō

Noun
Desu Copula

Expresses probability in a polite manner ("probably…") of 致死性家族性不眠症

1. Probably fatal familial insomnia.

Polite
Presumptive
Conjecture
Medicine