Cryptic
Part of speech: adjective
Definition: Having hidden meaning. Mystified or of an obscure nature. Involving use of code or cipher.
Part of speech: noun
Definition: A cryptic crossword.
Sibylline
Part of speech: adjective
Definition: Of or pertaining to a sibyl or female oracle, especially the Cumaean Sibyl and the Sibylline Books.Having oracle-like predicting powers, clairvoyant.