full of, characterized by, or involving mystery: a mysterious occurrence.
implying or suggesting a mystery: a mysterious smile.
of obscure nature, meaning, origin, etc.; puzzling; inexplicable: a mysterious inscription on the ancient tomb.

1610–20; mystery1 + -ous

mysteriously, adverb
mysteriousness, noun
quasi-mysterious, adjective
quasi-mysteriously, adverb
unmysterious, adjective
unmysteriously, adverb
unmysteriousness, noun

1. secret, esoteric, occult, cryptic. Mysterious, inscrutable, mystical, obscure refer to that which is not easily comprehended or explained. That which is mysterious by being unknown or puzzling, excites curiosity, amazement, or awe: a mysterious disease. Inscrutable applies to that which is impenetrable, so enigmatic that one cannot interpret its significance: an inscrutable smile. That which is mystical has a secret significance, such as that attaching to certain rites or signs: mystical symbols. That which is obscure is discovered or comprehended dimly or with difficulty: obscure motives. 3. unfathomable, unintelligible, incomprehensible, enigmatic, impenetrable. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
mysterious (mɪˈstɪərɪəs)
1.  characterized by or indicative of mystery
2.  puzzling, curious, or enigmatic

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1610s, "full of mystery," from L. mysterium (see mystery (1)). Related: Mysteriously.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
We share many of the same feelings for a place mysteriously etched into our
Then, mysteriously, the library vanished into history.
They were issued by automated cameras, usually in places where the posted speed
  limit mysteriously dropped without warning.
Yet even though many health statistics have been improving over the past few
  decades, a few illnesses are rising mysteriously.
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