nán​bǎo

cannot guarantee

难保 (難保) nán​bǎo
cannot guarantee verb
hard to say for sure or difficult to guarantee that something will not happen

No one can guarantee that he won't change his mind tomorrow.

difficult to protect verb
hard to keep safe, maintain, or preserve

In such an environment, these ancient buildings will be hard to preserve.

Frequency

Movie subtitles
1.19 per million appears in 1% of films
Written text
1.51 per million

Sources

Definitions
CC-CEDICT