cryptical

of an obscure nature

• “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” Rachel Carson
• “rituals totally mystifying to visitors from other lands”

having a secret or hidden meaning

• “cabalistic symbols engraved in stone”
• “cryptic writings”
• “thoroughly sibylline in most of his pronouncements” John Gunther