<p><strong>Adjective</strong></p><ul><li>full of, characterized by, or involving mystery: a mysterious occurrence.</li><li>Synonyms: cryptic, occult, esoteric, secret.</li><li>implying or suggesting a mystery: a mysterious smile.</li><li>of obscure nature, meaning, origin, etc.; puzzling; inexplicable: a mysterious inscription on the ancient tomb.</li><li>Synonyms: impenetrable, enigmatic, incomprehensible, unintelligible, unfathomable.</li></ul>