What is the meaning of mysterious?

adjective

• Of an obscure nature.
  • usage: "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"
  • synonyms: cryptic, cryptical, deep, inscrutable, mystifying
• Having an import not apparent to the senses nor obvious to the intelligence; beyond ordinary understanding.
  • usage: "mysterious symbols"; "the mystical style of Blake"; "occult lore"; "the secret learning of the ancients"
  • synonyms: mystic, mystical, occult, secret, orphic