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mysterious

[ mi-steer-ee-uhs ]
/ mɪˈstɪər i əs /
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adjective

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.

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Origin of mysterious

First recorded in 1610–20; mystery1 + -ous
1. 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.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

British Dictionary definitions for mysterious

mysterious
/ (mɪˈstɪərɪəs) /

adjective

characterized by or indicative of mystery
puzzling, curious, or enigmatic
mysteriously, adverbmysteriousness, 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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