mysterious
US /mɪˈstɪr.i.əs/
UK /mɪˈstɪr.i.əs/

1.
神秘的, 費解的, 不可思議的
difficult or impossible to understand, explain, or identify
:
•
The disappearance of the ancient artifact remains a mysterious case.
這件古代文物的失蹤仍然是一個神秘的案件。
•
She had a mysterious smile that made him wonder.
她有一個神秘的微笑,讓他感到好奇。