mys·te·ri·ous

[mi-steer-ee-uhs]
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:
1610–20; mystery1 + -ous

mys·te·ri·ous·ly, adverb
mys·te·ri·ous·ness, noun
qua·si-mys·te·ri·ous, adjective
qua·si-mys·te·ri·ous·ly, adverb
un·mys·te·ri·ous, adjective
un·mys·te·ri·ous·ly, adverb
un·mys·te·ri·ous·ness, 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.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
Cite This Source Link To mysterious
00:10
Mysterious is always a great word to know.
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an extraordinary or unusual thing, person, or event; an exceptional example or instance.
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
Collins
World English Dictionary
mysterious (mɪˈstɪərɪəs) [Click for IPA pronunciation guide]
 
adj
1.  characterized by or indicative of mystery
2.  puzzling, curious, or enigmatic
 
mys'teriously
 
adv
 
mys'teriousness
 
n

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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Etymonline
Word Origin & History

mysterious
1610s, "full of mystery," from L. mysterium (see mystery (1)). Related: Mysteriously.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
But there is another thing called dark energy, which is even more mysterious
  which no one really can get a hand on yet.
Mysterious holes for which there are no obvious reasons or explanations.
Over the past few days another, more mysterious spread has opened up.
The cause of the cuts in the two main broken cables remains somewhat mysterious.
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