xuán'àn

unresolved case

悬案 (懸案) xuán'àn
unresolved case noun
a criminal or judicial case that remains unsolved or open over a long period

This bizarre disappearance case remains an unsolved mystery.

unresolved question noun
an unsettled matter, outstanding issue, or mystery that remains unexplained

The real reason for his resignation remains a mystery.

Frequency

Movie subtitles
1.97 per million appears in 1% of films
Written text
0.486 per million

Sources

Definitions
CC-CEDICT