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mysterious

[mi-steer-ee-uh s] /mɪˈstɪər i əs/
adjective
1.
full of, characterized by, or involving mystery:
a mysterious occurrence.
2.
implying or suggesting a mystery:
a mysterious smile.
3.
of obscure nature, meaning, origin, etc.; puzzling; inexplicable:
a mysterious inscription on the ancient tomb.
Origin
1610-1620
1610-20; mystery1 + -ous
Related forms
mysteriously, adverb
mysteriousness, noun
quasi-mysterious, adjective
quasi-mysteriously, adverb
unmysterious, adjective
unmysteriously, adverb
unmysteriousness, noun
Synonyms
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.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for quasi-mysterious

mysterious

/mɪˈstɪərɪəs/
adjective
1.
characterized by or indicative of mystery
2.
puzzling, curious, or enigmatic
Derived Forms
mysteriously, adverb
mysteriousness, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for quasi-mysterious

mysterious

adj.

1610s, "full of mystery," from Latin mysterium (see mystery (n.1)) + -ous. Related: Mysteriously; mysteriousness. Earlier in same sense was mysterial (early 15c.), from Late Latin mysterialis.

Online Etymology Dictionary, © 2010 Douglas Harper
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