Example : The new insurance policy is written without cryptic or mysterious terms.
A deep dark secret.
The inscrutable workings of Providence.
In its mysterious past it encompasses all the dim origins of life.
Rituals totally mystifying to visitors from other lands.

Synonyms : cryptical, deep, inscrutable, mysterious, mystifying

Example : Cabalistic symbols engraved in stone.
Cryptic writings.
Thoroughly sibylline in most of his pronouncements.

Synonyms : cabalistic, cryptical, kabbalistic, qabalistic, sibylline

Example : A cryptic note.