mysteriously

US /mɪˈstɪr.i.əs.li/
UK /mɪˈstɪr.i.əs.li/
1.

một cách bí ẩn

in a way that is strange, not known, or not understood:

:
•
"Perhaps, and perhaps not," she said mysteriously.
:
mysterymysteriousmystery play