mysterious

Of, relating to, or being a religious mystery.

Arousing wonder or curiosity, especially by being difficult to explain or understand.

Partaking of or containing mystery; obscure; not revealed or explained; unintelligible.

Expressing, intimating, or implying a mystery: as, a mysterious look; his manner was very mysterious and important.

Of or pertaining to mystery; containing a mystery; difficult or impossible to understand; inexplicable; obscure; not revealed or explained; enigmatical; incomprehensible.

Of unknown origin

Having unknown qualities

having an import not apparent to the senses nor obvious to the intelligence; beyond ordinary understanding

of an obscure nature