1. Mysterious [a.] - Of or pertaining to mystery; containing a mystery; difficult or impossible to understand; obscure not revealed or explained; enigmatical; incomprehensible.

Definitions of mysterious adjective having an import not apparent to the senses nor obvious to the intelligence; beyond ordinary understanding “ mysterious symbols” synonyms: mystic, mystical, occult, orphic, secret esoteric confined to and understandable by only an enlightened inner circle adjective of an obscure nature