Dictionary
mys•te•ri•ous
Pronunciation: (mi-stēr'ē-us), [key]—
adj.
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. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.