bù​cè

mishap

不测 (不測) bù​cè
mishap adverb
an unexpected misfortune, accident, or contingency

We must be well-prepared in case of any unforeseen circumstances.

unfathomable idiom
unable to be measured or predicted; unexpected

Fortune is as unpredictable as the weather, and life is full of unexpected turns.

Frequency

Movie subtitles
3.04 per million appears in 2% of films
Written text
1.56 per million

Sources

Definitions
CC-CEDICT