The word "sibyllic" refers to something that is mysterious, prophetic, or enigmatic. If we want to express the idea of being even more sibyllic, we might use synonyms like "oracular," "cryptic," "inscrutable," "ambiguous," or "obscure." These words suggest a deeper level of mystery or mysticism, as if the information being conveyed is imbued with a special kind of power or insight that is not easily understood by ordinary means. Whether we are describing a person, a place, or a message, these words convey a sense of wonder and awe that is sure to captivate the imagination and pique the curiosity of anyone who encounters them.