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 : cryptic, cryptical, deep, inscrutable, mystifying

Example : Mysterious symbols.
The mystical style of Blake.
Occult lore.
The secret learning of the ancients.

Synonyms : mystic, mystical, occult, orphic, secret