[mi-steer-ee-uh s] /mɪˈstɪər i əs/

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

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.


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