(noun) any of several prophetesses usually accepted as 10 in number and credited to widely separate parts of the ancient world (as Babylonia, Egypt, Greece, and Italy) / (noun) prophetess / (noun) fortune-teller
the sibylline comment in French
Lacan's own notoriously sybilline style, a language of the unconscious all in itself
thought this meant something to do with the letter s lol