bù​míng

fail to understand

不明 bù​míng
fail to understand adverb
to fail to understand or be ignorant of

He didn't know the truth, which is why he misunderstood you.

unclear adverb
not clear or unknown

The cause of the fire is currently unknown.

Frequency

Movie subtitles
11.5 per million appears in 3% of films
Written text
18.8 per million

Sources

Definitions
CC-CEDICT